Independent Dealers Advantage What a friggin ripoff they are Suwanee, Georgia

My son and I went to this place because he seen a car online there that he wanted to look at,once we got there they immediately started hounding us to buy the car, so he finally decided to . we went inside to start the paper work. he paid 600 down and his first payment was due 30 days from then, about a week and a half later they called him and me everyday all hours wanting the payment of 539.00. he didnt have it they locked the car down. I called them and told them to unlock the car they said not until we get the $539 which wasnt due for 30 days . I  told them if they didnt unlock it they could come and get the d*** thing so they did. About a year later I get a summons from the county I live in where they where suing me for 7000.00 depreication . I went to court and they judge here throwed it out. They went to fulton co and redid it there now my wages are being granished. How in the h*** can a 2003 mustang depreicate 7,000 dollars in less than a month. I did a car facts on the car they have sold it 6 times and repo since then.