Lay out what was paid and owed in a vendor billing dispute with ChatGPT (it invented invoice numbers)

Posted

Mar 11, 2026 by Jamaal Glenn (LinkedIn)

·

Last checked

Oct 17, 2026

·

Method:

How we verify

Evidence: Described by posterThe person describes what happened in words, without screenshots or video.

Outcome

A business owner fed ChatGPT all of the payment history, invoices and email threads from a vendor billing misunderstanding and asked it to set out exactly what had been paid and what was still owed. Five seconds before sending the email, he spot-checked a couple of invoice numbers and found they were all made up: they looked real and had the right format, but none existed. He didn't send it.

Agent

ChatGPT

The source didn't share its exact prompt, so we wrote this from what it describes.

Run this task now, exactly as written below. Everything you need is here, so start straight away and only stop if something required is missing or a rule below tells you to.

Goal: Reconcile what has been paid and what is still owed, using only the documents I provide.

Fill in before running:
- Invoices: [ATTACH]
- Payment records: [ATTACH]
- Email thread with the vendor: [ATTACH]

Rules:
- Use only invoice numbers, dates and amounts that appear word for word in my documents.
- For every line, name the document and page it came from.
- If something is missing or unclear, write 'not found' instead of filling it in.
- Draft the email only after I approve the reconciliation table.
- If a site asks for a login, a CAPTCHA or payment details, stop and hand control back to me.
- Ask for my OK before you pay, book, send, submit or cancel anything.
- Check facts that can change (prices, opening hours, dates, availability, rules) against the official source, and tell me anything you couldn't verify.

Output: A reconciliation table with sources, then a draft email.

You'll know it worked when: every number in the email matches a document I can point to.

Run this task now, exactly as written below. Everything you need is here, so start straight away and only stop if something required is missing or a rule below tells you to.

Goal: Reconcile what has been paid and what is still owed, using only the documents I provide.

Fill in before running:
- Invoices: [ATTACH]
- Payment records: [ATTACH]
- Email thread with the vendor: [ATTACH]

Rules:
- Use only invoice numbers, dates and amounts that appear word for word in my documents.
- For every line, name the document and page it came from.
- If something is missing or unclear, write 'not found' instead of filling it in.
- Draft the email only after I approve the reconciliation table.
- If a site asks for a login, a CAPTCHA or payment details, stop and hand control back to me.
- Ask for my OK before you pay, book, send, submit or cancel anything.
- Check facts that can change (prices, opening hours, dates, availability, rules) against the official source, and tell me anything you couldn't verify.
- Before sending, check every invoice number and amount against the original documents yourself.

Output: A reconciliation table with sources, then a draft email.

You'll know it worked when: every number in the email matches a document I can point to.

Before you finish: re-read my goal and constraints, check your answer against each one, and list anything you assumed or couldn't confirm.

Source

https://www.linkedin.com/posts/jamaalglenn_i-asked-chatgpt-to-help-me-settle-a-billing-activity-7437575639760666624-9NoV