NOTICE OF FOOD STAMP OVERPAYMENT (DEMAND LETTER) (Timely and Adequate). NOTICE. Where should I mail my payment?Make payments out to: Ambulance Service EMS Orange County Revenue P.O. Box 8181. The demand letter will include an attachment that will provide the original claim number, beneficiary name,. The salary overpayment resulted because . â–» If the amount of the overpayment was more than. Tell them that they have "overpaid" you. Then ask them to ring you for details.