How long will it take to get a decision? Most customers are receiving responses less than two weeks after completing and submitting the DocuSign.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. If you were overpaid, you will receive a written notice in the mail. A business may request a refund due to overpayment of tax. The overpayment may be the result of an amended return, audit or more money paid than was owed. Clearly state the decision regarding the refund. HRA may collect overpayments of cash assistance benefits you may have received. HRA recovers these overpayments through a process called recoupment.