I am a conscientious borrower and historically have kept my student loans payments up to date. To make this easier, I changed from individual internet payments to using the bill pay service from my bank. When I made internet payments to ACS, they would divide the payment between my XXXX accounts there. When I changed to my bill pay service, they began to apply the payments exclusively to XXXX account. Consequently, XXXX account is now paid up through spring next year. But the XXXX account is listed as overdue. They reported me to the credit agencies because of the overdue account. I have called multiple times explaining the circumstance, and asked them to apply the amount necessary from the over-paid account to the past due account to bring it current. I now make to separate payments each month to keep the overdue balance from getting larger. But despite my efforts and multiples calls, they still have not transferred funds from the over-paid account to the overdue account. They have reported me to the credit agencies, which has had an impact on my credit rating. And they keep calling me and hounding me at work. I see no reason why a consumer who has over-paid ACS should be subject to the embarrassment of being called by creditors at work ; a decrement in my credit score ; and the frustration of explaining the circumstance over and over only to have ACS fail to address the circumstance. Please help.