Carrier Bill CheckExample data A fictional company, Maple Logistics, and its fictional carrier Northline Communications.
October 2026's carrier bill, 30 lines, checked
Northline Communications billed Maple Logistics $4,505.05 for October on account 8817-44120. Carrier Bill Check read every line, checked it against the company's disconnect list and September's approved bill, and lists the lines to dispute. This is the real checker on example data.
30lines checked, $4,505.05 billed
$1,087.39to dispute on 5 lines
2Billed after disconnect · $906.19
1Duplicate · $45.00
1Rate changed · $61.20
1One-time charge repeated · $75.00
1New recurring line
The findings
| Finding | Service ID | Line | What changed | To dispute |
|---|---|---|---|---|
| Billed after disconnect | 45.KQGN.118230..NL | Dedicated Internet 100 Mbps - Joliet Dock 3 line 1 | Disconnected 2026-08-31; billed $612.00 for 2026-10-01 to 2026-10-31. $1,224.00 billed since the disconnect, on 2 invoices. | $612.00 |
| Billed after disconnect | 72.MPLS.300912..NL | MPLS port 50 Mbps - Memphis DC line 3 | Disconnected 2026-10-12; check proration: 19 of 31 days of 2026-10-01 to 2026-10-31 are after it, $294.19 of $480.00. | $294.19 |
| Rate changed | SIP-0044120-01 | SIP trunk channels - Columbus HQ line 5 | Unit rate changed from $17.00 to $20.06 since last month (+18.0%): $61.20 a month, $734.40 a year. | $61.20 |
| New recurring line | IPB-77310 | Static IP block /29 - Columbus HQ line 6 | Not on last month's bill: $25.00 a month. Confirm you ordered it. | confirm |
| Duplicate | 312-555-0147 | Business Unlimited line 24 | Billed twice on this invoice (also line 23): $45.00. | $45.00 |
| One-time charge repeated | 901-555-0170 | Reconnect fee line 27 | $75.00 one-time charge also billed last month (invoice NL-2609-4471): "Reconnect fee". | $75.00 |
| Total to dispute | $1,087.39 | |||
The disconnect list
| Service ID | Description | Disconnected |
|---|---|---|
| 45.KQGN.118230..NL | DIA 100M, Joliet Dock 3 (site closed) | 2026-08-31 |
| 72.MPLS.300918..NL | MPLS port, Joliet (moved to SD-WAN) | 2026-09-30 |
| 72.MPLS.300912..NL | MPLS port, Memphis DC (moved to SD-WAN) | 2026-10-12 |
The company's own record. The Joliet MPLS port was disconnected on September 30 and is not on October's bill, so nothing is flagged for it.
The dispute note
To: Northline Communications billing disputes
Account: 8817-44120
From: Maple Logistics
We dispute the following 5 charges:
1. Invoice NL-2610-4519 (October 2026), line 1, service 45.KQGN.118230..NL, "Dedicated Internet 100 Mbps - Joliet Dock 3": $612.00.
Billed after the service was disconnected. Disconnected 2026-08-31; billed $612.00 for 2026-10-01 to 2026-10-31. $1,224.00 billed since the disconnect, on 2 invoices.
2. Invoice NL-2610-4519 (October 2026), line 3, service 72.MPLS.300912..NL, "MPLS port 50 Mbps - Memphis DC": $294.19.
Billed after the service was disconnected. Disconnected 2026-10-12; check proration: 19 of 31 days of 2026-10-01 to 2026-10-31 are after it, $294.19 of $480.00.
3. Invoice NL-2610-4519 (October 2026), line 5, service SIP-0044120-01, "SIP trunk channels - Columbus HQ": $61.20.
The recurring charge changed. Unit rate changed from $17.00 to $20.06 since last month (+18.0%): $61.20 a month, $734.40 a year. Please confirm the contracted rate and credit the difference if it does not apply.
4. Invoice NL-2610-4519 (October 2026), line 24, service 312-555-0147, "Business Unlimited": $45.00.
Billed twice. Billed twice on this invoice (also line 23): $45.00.
5. Invoice NL-2610-4519 (October 2026), line 27, service 901-555-0170, "Reconnect fee": $75.00.
One-time charge billed again. $75.00 one-time charge also billed last month (invoice NL-2609-4471): "Reconnect fee".
Total disputed: $1,087.39.
Please credit these amounts on the next invoice and confirm by reply.
Plain text to paste into the carrier's dispute form or email. Carrier Bill Check never sends it or contacts the carrier.
September, checked first
September was Northline Communications's first bill here, so only the disconnect and duplicate checks ran: there was no earlier bill to compare rates with. It flagged 45.KQGN.118230..NL at $612.00. October is checked against September's approved lines.
October's invoice lines
| # | Service ID | Description | Type | Period | Qty | Rate | Amount |
|---|---|---|---|---|---|---|---|
| 1 | 45.KQGN.118230..NL | Dedicated Internet 100 Mbps - Joliet Dock 3 | Recurring | 10-01 to 10-31 | 1 | $612.00 | $612.00 |
| 2 | 45.KQGN.118244..NL | Dedicated Internet 500 Mbps - Columbus HQ | Recurring | 10-01 to 10-31 | 1 | $1,180.00 | $1,180.00 |
| 3 | 72.MPLS.300912..NL | MPLS port 50 Mbps - Memphis DC | Recurring | 10-01 to 10-31 | 1 | $480.00 | $480.00 |
| 4 | 72.MPLS.300901..NL | MPLS port 100 Mbps - Columbus HQ | Recurring | 10-01 to 10-31 | 1 | $760.00 | $760.00 |
| 5 | SIP-0044120-01 | SIP trunk channels - Columbus HQ | Recurring | 10-01 to 10-31 | 20 | $20.06 | $401.20 |
| 6 | IPB-77310 | Static IP block /29 - Columbus HQ | Recurring | 10-01 to 10-31 | 1 | $25.00 | $25.00 |
| 7 | 614-555-0100 | Business line - Columbus fax | Recurring | 10-01 to 10-31 | 1 | $54.95 | $54.95 |
| 8 | 614-555-0101 | Business line - Columbus alarm | Recurring | 10-01 to 10-31 | 1 | $54.95 | $54.95 |
| 9 | 901-555-0170 | Business line - Memphis elevator | Recurring | 10-01 to 10-31 | 1 | $62.40 | $62.40 |
| 10 | 815-555-0133 | Business line - Joliet fire panel | Recurring | 10-01 to 10-31 | 1 | $62.40 | $62.40 |
| 11 | HV-1001 | Hosted voice seat - Columbus HQ | Recurring | 10-01 to 10-31 | 1 | $24.00 | $24.00 |
| 12 | HV-1002 | Hosted voice seat - Columbus HQ | Recurring | 10-01 to 10-31 | 1 | $24.00 | $24.00 |
| 13 | HV-1003 | Hosted voice seat - Columbus HQ | Recurring | 10-01 to 10-31 | 1 | $24.00 | $24.00 |
| 14 | HV-1004 | Hosted voice seat - Columbus HQ | Recurring | 10-01 to 10-31 | 1 | $24.00 | $24.00 |
| 15 | HV-1005 | Hosted voice seat - Columbus HQ | Recurring | 10-01 to 10-31 | 1 | $24.00 | $24.00 |
| 16 | 312-555-0140 | Business Unlimited | Recurring | 10-01 to 10-31 | 1 | $45.00 | $45.00 |
| 17 | 312-555-0141 | Business Unlimited | Recurring | 10-01 to 10-31 | 1 | $45.00 | $45.00 |
| 18 | 312-555-0142 | Business Unlimited | Recurring | 10-01 to 10-31 | 1 | $45.00 | $45.00 |
| 19 | 312-555-0143 | Business Unlimited | Recurring | 10-01 to 10-31 | 1 | $45.00 | $45.00 |
| 20 | 312-555-0144 | Business Unlimited | Recurring | 10-01 to 10-31 | 1 | $45.00 | $45.00 |
| 21 | 312-555-0145 | Business Unlimited | Recurring | 10-01 to 10-31 | 1 | $45.00 | $45.00 |
| 22 | 312-555-0146 | Business Unlimited | Recurring | 10-01 to 10-31 | 1 | $45.00 | $45.00 |
| 23 | 312-555-0147 | Business Unlimited | Recurring | 10-01 to 10-31 | 1 | $45.00 | $45.00 |
| 24 | 312-555-0147 | Business Unlimited | Recurring | 10-01 to 10-31 | 1 | $45.00 | $45.00 |
| 25 | 312-555-0148 | Business Unlimited | Recurring | 10-01 to 10-31 | 1 | $45.00 | $45.00 |
| 26 | 312-555-0149 | Business Unlimited | Recurring | 10-01 to 10-31 | 1 | $45.00 | $45.00 |
| 27 | 901-555-0170 | Reconnect fee | One-time | 1 | $75.00 | $75.00 | |
| 28 | 8817-44120 | Federal Universal Service Fund surcharge | Tax or fee | $91.40 | |||
| 29 | 8817-44120 | State and local 911 fees | Tax or fee | $12.00 | |||
| 30 | 8817-44120 | Regulatory cost recovery fee | Tax or fee | $18.75 | |||
| Total | $4,505.05 | ||||||
Shaded orange: a line with a finding to dispute. In the app, a text PDF is read for you and a spreadsheet by its columns; you check the lines beside the file and approve before anything is checked.
Run it yourself
Download the sample's files and upload them in the app, or check one invoice of your own on the free check.