Sample Letter 8.14 was written to offer retail credit to a customer who had filled out an application when she was in one of the company's stores. I respectfully request that your offices provide me with competent evidence that I have any legal obligation to pay you.Below is a sample letter to help you craft your own letter. Send the letter via certified mail and keep the return receipt for your records. Here's how to write a debt validation letter: 1. How to use the template: 1. In the sample letter, fill in your personal information. Have you recently settled a debt and are searching for a paid in full letter? Good news, we've got two free sample form letters below. To the credit reporting company.