American Intercontinental University AIU Rip-off Internet

I was a student on American InterContinental University from April 25, 2016 to May 02, 2017. I completed my Associates on Criminal Justice. I utilize my GI Bill benefits, which VA covers 100% my tuition. In addition I receibed some payments from the Yellow Ribbon Program. Qualified for FAFSA, and for that reason AIU is saying that I have a debt with them. According to them they can not hold on to additional funds in the account and now that I am done with school they are charging me for a balance from June 21, 2016. Eventhough the records show that I had no balance up to October 25, 2016. I have called two times and sent an email and all they answered was that they could not hold the funds and I was still have a balance, so now I have to pay that balance on top of an online graduation fee.