I paid of my XXXX student loan more than two years ago and even received an email congratulating me for paying off my loan. Recently, I began receiving emails from XXXX about my balance being available, but when I logged in to their website, there was no balance. I assumed this was a computer error. However, XXXX apparently has sold my imaginary debt to AES, which now claims my debt is XXXX plus XXXX in unpaid interest. There is no way this is even possible. Ten days ago, I submitted a written request for verification of the debt to AES, at which point they began harassing me with phone calls multiple times a day. Then today I received an email from AES saying my request could not be completed because I never returned their calls. I realize this is for a small amount of money, but it is money that I do not owe, and I have a right to receive written verification of the debt. My credit has already been ruined by student loans and I'm not going to start paying made-up debts that I don't owe.