NOTICE OF FOOD STAMP OVERPAYMENT (DEMAND LETTER) (Timely and Adequate). NOTICE. If you were overpaid, you will receive a written notice in the mail.Not OP but received the same letter. The salary overpayment resulted because . Write the doctor's office a firm but polite letter. If they refuse, file a case in Magistrates Court against the doctor. The letter stated that Plaintiff was overpaid because he was living in a public institution during that time.