Complaint Review: UACC - United Auto Credit Corporation

We need to find an attorney to take our case in this matter, I bought my truck in 06, and having my truck now 3 years and still have 3 1/2 years left to pay. My vehicle was repo after being 2 weeks late in Oct 07, I got my vehicle back after making a payment. Back on last year 08 I went into office to pay vehicle off and looking at my receipts I only owed $8900.00 on it and they told me my payoff was going to be $12,500, I told them they had to be crazy and I was not going to pay it off and I just paid it up for about 4months, the amount I paid only $628 went toward principle balance and the rest went toward interest. I called the company on 12/02/09 and asked for a payment history of my car loan and after looking at it it's a shame how this company can get away with charging us interest back onto our loan.  I noticed that my balance on 10/21/09 was $9800 I made a payment and they added my interest back onto loan of $263 which took my balance back up to $10,121.00. Now they only financed $14449.00 I've paid over $15,000.00 on this vehicle and they say I still owe them $10,121.00 so what do you all think fair or unfair we need to get a lawsuit going and stop these company from taken advantage of people with poor credit. They also have very high interest rate 24%.