Phoenix overpayment letters: Keep an eye out for overpayments that are over six years old (June 30, 2022, updated September 27, 2022). Make sure to fill out Annex B in your overpayment letter within the deadline provided even if you file a grievance.If you have received an overpayment letter, please refer to the FAQ section below before taking any action. Place the completed Form 203 on top of your tax return. These FAQs outline how to respond to an overpayment letter and provide guidance on next steps. If you have additional questions or concerns, please contact the Benefit Payment Control unit at 602) 364-4300. Members receiving overpayment letters must respond promptly, as they are given four weeks to do so. Please provide as much detail below to explain why you are requesting a waiver and why you cannot pay back the overpayment. How do I pay back my overpayment?