Better teacher than student, perhaps

I started back to college at West Georgia before I landed the teaching gig. What a nightmare trying to deal with that. Everyone I talked to there was purely incompetent. Noone knew anything. The inmates ran the asylum. I finally got it all ironed out so I could actually take classes. Then came the teaching position........and NTI. It was easier to get back into GSU, maybe because I had attended GSU previously, or because of the way NTI is set up, or maybe both. Then I started the financial aid ball rolling. It seemed all was well until I get a message today that I owe $1739 for THIS semester. What? I already paid it in full. They ran my financial aid through and I was reimbursed. What is going on? Do I now have to pay that and come up with next semester's cash too? Teaching is hard enough without extra classes but now I have another mess to try to iron out. HELP!!! Any ideas y'all??????????