I have been using XXXX XXXX Bill Pay to make payment on my loans with American Education Services for a number of years without issue. XXXX in a row AES has failed to process the payment correctly. Their proof of payment process takes XXXX business days, during which they continue to call, email and send letters to you and your co-signer. They have no way of processing it faster or putting your account on hold or in a disputed state to at least temporarily halt the calls, emails and letters. The only way to halt the calls, emails and letters is to make an additional payment. If you do n't it may negatively affect your credit score. Emails they send come on the weekend when there is no service agent to talk to.