1. In the sample letter, fill in your personal information. See a sample credit dispute letter below.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. Get your free copy here! I live in California, I have since found out that the loans are illegal in California. The Second Collection Letter Template. Your credit history helps lenders know how you've handled debt in the past. In the opening paragraph, clearly state your request for debt validation.