1. In the sample letter, fill in your personal information. Use this sample letter to dispute mistakes on your credit report.A letter of credit is a letter from a bank guaranteeing that a buyer's payment will be received on time and for the correct amount. Your letter should also include copies of important documents to help the bureaus conduct an investigation. 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. I demand that you send me a copy of my updated credit report showing the elimination of the items, which I disputed on the attached letters. Below you will find samples of the four types of dispute letters we outline above. You can download a template letter in Word for each type of dispute. We can provide you with guidance on how to fill out forms. We can usually answer questions about court deadlines.