Product: Debt collection

I graduated in XX/XX/XXXX, In XX/XX/XXXX I requested to have payments decrease due to economic hardship from the original holder of my student loan XXXX XXXX. In XX/XX/XXXX I was planning on continuing studies and requested a deferment. I was informed that private loans do not qualify for deferment. At that time I went from XXXX XXXX to XXXX XXXX XXXX. My original amount was {$21000.00}. I then requested a forbearance due to the amount they wanted {$810.00}. Although I had requested a forbearance I was sent invoices to pay amount due, continuously. I requested another forbearance, however, I never received notification that my loan went from XXXX XXXX XXXX to XXXX XXXX. At this time I was in my studies and found out that I was sent to collections in fall of XX/XX/XXXX. At this time I had never received written correspondence from XXXX and before long I was put into collections, spring of XX/XX/XXXX, XXXX XXXX XXXX , XXXX ( XXXX ). At this time the loan was {$24000.00}. I was in school at that time spoke to someone XXXX XXXX and made arrangements to send {$200.00}, {$200.00} and {$1000.00}. Then, over the years speaking to different customer representatives I was paying {$200.00} per month from XX/XX/XXXX until XX/XX/XXXX then I paid {$100.00} per month until XX/XX/XXXX. From XX/XX/XXXX until XX/XX/XXXX I had been {$150.00} per month except XX/XX/XXXX when I paid {$200.00}, XX/XX/XXXX {$160.00}, and from XX/XX/XXXX to XX/XX/XXXX {$170.00}. XXXX XXXX XXXX, XXXX, changed there name to XXXX XXXX, XXXX XX/XX/XXXX. At one time I took them to the XXXX XXXX  XXXX   due to their threatening tactics. 
Now, in XX/XX/XXXX, they sold my account to XXXX XXXX XXXX XXXX XXXX who contacted me telling me I owe money and they were attempting to collect this debt. I tried asking the lady information and she refused to give me any particulars, telling me I will receive notice in the mail, but this was in XX/XX/XXXX. I was not home due to a family emergency and I received a call again stating they were XXXX XXXX XXXX attempting to collect a debt for money owed to this XXXX XXXX XXXX. I informed the gentleman I had never went to that school and I had no idea about that school or the loan. All the while I was paying XXXX XXXX for both XX/XX/XXXX and XX/XX/XXXX. 
All of my correspondence with first XXXX XXXX XXXX  and then XXXX XXXX, they have always told me they could n't do any thing for me regarding my loan that it was up to the holder of the loan XXXX. In XX/XX/XXXX I reached out to XXXX only to find out they knew nothing about this loan or had any information about me. I do n't understand if I paid close to {$40000.00}, why was my account now sold to someone else and put through collections when the holder XXXX had no idea about me. 
I received a letter from the XXXX XXXX XXXX dated XX/XX/XXXX stating my loan was transferred by XXXX XXXX ( who I do not know ) to them with the same terms and conditions, but this transfer is not publicly recorded, however, they have sent me to collections XXXX XXXX XXXX for {$13000.00}. This feels like a fancy scam to get another {$40000.00} out of me which I do not have. 
I never new this site existed or I would of request help, assistance or direction in the past to deal with this matter. Please help me I think it is unfair that I have to go through this all over again. There must be something that can be done to these unfair practices of getting money out of hard working citizens.