1. In the sample letter, fill in your personal information. 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! Fill out a credit dispute letter and include supporting documents. It is essential to have a detailed credit dispute letter template to inform the bureau of the discrepancies and have it make modifications. Our guide will teach you how to write a letter of explanation, plus offers a free template to help you write one of your own.