Help!

I recently recieved a letter from Asset Acquisition Group, LLC statint that they acquired a debt I owe to Federal Truck Driving School, some time back in 1988, This company was paid in full via my Government Student Loan, which I am still paying off! My first contact with them was with a Mr. Meyers, I explained to him that this student loan was bought by a company named aes and I have been making payments to them until recently, I receved a letter from them telling me that my account had been put in deferment until 2011, when I graduate from the current college program I am enrolled in. Mr Meyers seemed to have no knowledge of this information, he asked me to fax him the letter from aes, I told him I would, as soon as I found it. a week later I had not found the letter, so I called Mr. Meyers to inform him that I still had not found the letter, but had called aes to enquire about them selling my account to Asset Acquisition Group, LLC. aes told me they knew nothing about it, Mr. Meyers apparently was not in his office, so I left a message for him to call me, which he did not!, a couple of days later I called him again, the person answering the phone told me she would put me through to his office, instead I was disconnected, I called back, was put through to Mr. Meyers office again, when he came on the line he seemed to remember me, and we had a short conversation about this account, he told me that he needed to gbet a file and would be right back, after waiting about 10 minets I was disconnected, I called back again and they hung up on me! I am getting the feeling that I am being scamed, not just because of the phone situation, or the fact that aes told me that they had not sold my contract, but also because according to the letter from Asset Acquisition Group, LLC said the amount they were trying to collect is $5,143.35 and I find this very amusing because this was the origional amount of the Student Loan, but I have been paying on it for almost 3 years now and the balance is now $2,243.17 Also if one goes to NSLD.com they will find a listing that shows that this account is in deferment and will remain there until 03/30/2011 now can someone explain to me what is up with this Asset Acquisition Group LLC?