I was a co-maker on the student loan with my son, XXXX XXXX. In XXXX 2015, I refinanced my home to pay of this loan in the amount of {$97000.00}. 
On XXXX/XXXX/2015, the loan statement sent by ACS gave a loan balance of {$96.00}, XXXX. I made a payment on XXXX/XXXX/2015 in the amount of {$97.00}, XXXX on this loan having refinanced my home. I now have received several calls ( XXXX 2015 and into XXXX XXXX, 2015 ) and bills dated XXXX/XXXX/15 ) stating I owe {$530.00}. In my many conversations with the representatives, I have asked for a detailed explanation of why I still owe this amount. I am very confused because the amount due on XXXX/XXXX/15 was {$96000.00} and payment of the loan through escrow on XXXX/XXXX/15 was {$97000.00}. Please help!!