Bold, black areas on this example would be changed to meet the correct names, dates, bank, amounts, etc. Financial Institution Name.IRREVOCABLE LETTER OF CREDIT (Sample). Date of Issue: ______. 1. In the sample letter, fill in your personal information. Use this sample letter to dispute mistakes on your credit report. 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. A wellcrafted credit inquiry letter of explanation can explain honestly and clearly your financial history and your real estate ownership. I am repairing my credit and attempting to settle several accounts besides this one.