GM Financial Americredit Financial Loan sharks out for blood Arlington, Texas

I am so exhausted dealing with this company! They have ripped me off so bad and continue to do so!
The closer I get to paying them off, they keep adding extra interest and charges on to my account. My contract says that the loan is for 72 months, but when I got to 71 months with 1 month left to go, they literally added 10 more months to my contract. It even reflects 82 months on their website, and on my credit report now.
When I try to get an answer from them as to what these charges are for, I will get different answers everytime I call and get a new agent!  The agents never tell you their name only their ID #s. That's very impersonal and unprofessional to me! They refuse to do any corrospondence in writing or through e-mail, so you just have to take their word for whatever they say with no proof of what they said.
They bill you on the 10th of the month for the next month and if it is not paid by the 1st, it is considered late and you will get 10 to 20 harrassing phone calls per day, even on your job!
I signed the contract in Sept 2006 and the contract says 1st payment wasn't due until Nov 13th, 2006, but on Oct 5, 2006, the account had already accrued $62.19 for interest and when I paid my note on time on Nov 13, 2006, the interest was already at $538.96. So, when I made my first payment of $441.76 per my contract, I was already in the hole because I had not made the payment in October, which they failed to educate me on! I was screwed from the start and was at their mercy! Every penny that I paid for the 1st 6 months on this car loan went to interest, and the interest continues to keep going higher and higher. This leaves me feeling like I will never be able to pay off this car because they keep adding interest to it!
They repossed my car in Nov 2009 saying that I owed for 3 months. They count the pre billed months as past due, which means that my account always appears to look like I am past due even though I am making monthly payments. They reflect this every month on my credit report, even though I have proof that I am paying them every single month. This cannot be legal to just ruin someones credit like this!!
To add salt to injury, they repossed my car again on December 28, 2012 at 9:30 pm knowing that they were closed on the weekends, but they charge you for storage fees. When I called to ask why they repossed my car they said that I owed for Oct, Nov, and Dec, but I had proof that I only owed for December. (December wasn't even over with yet!) When it was all said and done and I paid them what they said I had to pay to get my car back, the money paid went towards Dec 2012, Jan 2013, and Feb 2013! That right folks.........Their website (which I printed) clearly states that I do not owe them another payment until March 1st. I spoke with Caroline in the reinstatement dept to question payoff totals, I asked her to send me an e-mail stating what she confirmed that I don't owe another payment until March 1st, and to send payoff total. Two days later, I am still waiting for that confirmation through e-mail, but I bet I won't get it. They will never put anything in writing because they know they will be held accountable for it!
I need a good attorney, because I know that this car has more than been paid for, but they won't let me out of it!!
Do NOT do business with GM financial or you will find yourself in the same situation! I have already paid about thirty thousand or more for a 2006 Kia Spectra, but they said that I still owe $9,089 before it will be paid off!