fraud , harassing calls , deceptive practices

I took out a loan with western sky funding. They sold the loan to cash call. cash call tried to debit my acct before the agreed date. I contacted cash call and complained. They were rude ,so i ask about the terms of my loan. They quoted an interest rate that was 3 times the rate told to me by western sky.I stopped the automatic debiting because they had also caused my acct to go negative.I told them that i was on disability and could not pay them 11,400.00 for a 2,600.00 loan and they were fraudulent. They started calling me as many as 12 times a day threatening me and calling my landlord friends relatives.They say vulgar things about my mother and call me deadbeats. I told them that i was not going to pay them and not to call me . They call more.