I re-financed a private student loan serviced by AES. AES received the payment from my new lender on XX/XX/XXXX. AES told me they did not mail a check for the amount of overpayment ( {$470.00} ) until XX/XX/XXXX. The overpayment resulted from a delay in when I applied for a refinancing loan and when the documents were signed. Despite AES 's claim that this check was sent to my new lender on XX/XX/XXXX, the new lender 's servicer did not receive the refund until XX/XX/XXXX. This seems to be an unconscionable delay, as I was charged for XXXX months of interest on this overage amount. A refund of an overpayment should not take XXXX months in this digital age and overpayments appear to be an unavoidable consequence of the delay involved in reviewing refinancing offers. A XXXX issue I have with my new loan servicer ( XXXX XXXX XXXX ) is that the refund of the overpayment was not reflect on my online account - I had to call them to request a special payment history to receive an explanation of how the refund was applied to my balance.