Form SSA632, Request for Waiver of Overpayment Recovery, can be used to seek a waiver. A demand letter is a letter you can send to try to resolve a dispute before going to court.Demand letters are often sent in cases where someone owes money. Majority of the states are good as long as you don't take employees' wages below minimum wage. Go to SSA and talk to them. If it is an error they will probably work with you to correct it. There are instances where you as the child custody paying parent may send a child support payment that exceeds the court ordered amount. Demand letters: Upon detection of a potential overpayment, Medicare or Medicaid will send a demand letter requesting payment.