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.This action may make it possible for DEEOIC to waive recovery of the overpayment. The salary overpayment resulted because . Making Payments on an Overpayment. Payments towards overpaid UC benefits may be completed online at benefits.uc.pa. Determine whether the recipient(s) was eligible for any other category of.