You have a small desktop publishing firm. Unfortunately, not all your clients pay promptly. Our customer has a bill for designing and printing a brochure for Juggles, Inc., a company that provides clowns and jugglers for parties. This bill is now five weeks over- due. You have phoned twice, and each time the person who answered the phone promised to send you a check, but nothing has happened. Write a letter requesting this customer pay this bill.