You are supposed to begin a business letter with "Dear sir, Dear Ms Smith, Dear Jill', etc. Use this sample letter to help you write your dispute letter.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. The letter must follow all the rules of professional letter writing, including the sender's contact information, date, salutations, and recipient's address. What do you include in a debt collection letter? We've created ready-to-use collection letter templates. Read on below to find out what every letter should say in order to collect payment as soon as possible. Use this fill-in-the-blank Notice of Credit Limit letter to notify clients when they've exceeded their credit limit. Dear <> <>,.