Payments for supportive service in excess of the amount which either client or provider is eligible to receive. 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. The salary overpayment resulted because . NOTICE OF FOOD STAMP OVERPAYMENT (DEMAND LETTER) (Timely and Adequate). NOTICE. MEDI-CAL POTENTIAL OVERPAYMENT REPORTING WORKSHEET - PROPERTY. The address is listed on your overpayment letter.