1. In the sample letter, fill in your personal information. Use this sample letter to dispute mistakes on your credit report.Keep your letter of explanation simple and to the point. Your lender simply wants to know the reason behind any recent credit inquiries. Mortgage lenders might request a letter of explanation for various red flags that come up in underwriting. Learn how to write one, and download a template. See a sample credit dispute letter below. 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. My lender is asking for 2 letters of explanation for 1)all derogatories on credit report and 2)2 chargeoff accounts. You can use the letter for deposits, to explain conflicting information, and more.