Legal Advice?

I had received a letter from a National Loan Servicing Center stating that I owe the college I recently graduated from $850.88 and I tried to get into the Navy and the Chief called the college that Irecently graduted from and someone told him in Finacial Aid that I did graduate but I owe the college $5000 and I told him that that cannot be right I told him that I had received a letter from a loan company that I only owe the college that I had attend $850.88 for tuition and I contacted the school where I had graduated from and someone told me in Finacial Aid that they was not aware of the loan and I contacted the loan company and someone told me that I had signed the contact with someone in Finacial Aid in November and I had told someone that that is a lie and someone from the school that I was attending signed my name and I was not aware of it In this situation what should I do?Legal Advice?
First of all get a notebook and make sure you keep a list of the names and numbers of the people you talk to. If you can, dig up all the paperwork you can and keep it all in one place. Is there a way that you can get a copy of that contract someone else may have signed? Do you know about how much you should owe? I wouldn't pay the loan company until I get it straight with the college.