How to use the template: 1. In the sample letter, fill in your personal information.Use this sample letter to dispute incorrect or inaccurate information that a business supplied to credit bureaus. Sample Letter of Credit. Listen. First, download the form to your desktop and save to your personal computer. If paying with a Personal Check a Letter of Credit is need, here is a. SAMPLE. Please note: Some forms are not electronic forms. You must complete these forms and print them to be returned to the bank.