Select Benefit Overpayment Services. This brief but important letter notifies a customer that he or she has overpaid you.It can serve as a very good customer relations letter. This program will help you write a letter that formally requests the money you are owed. This is called a Demand Letter. You have been sent a Notice of Action letter that advised you of reason for the overpayment and the amount you were overpaid. Majority of the states are good as long as you don't take employees' wages below minimum wage. What to include in the San Diego demand letter? OCSC refund request form. Fill out the request for a refund letter addressed to the Orange County Superior Court on your company's letterhead.