bought a car from them

I bought an 2005 pontiac sunfire off of them about 5 months ago, the check engine light was on so the people there ran the codes and said it was nothing just something from people not hitting the reset switch after changing the oil, so we bought it. Not many days later it started acting up so we ran the codes our selves and they had lied about the codes! The car had transmission problems and now it wont go in reverse, they made us sign a paper buying it as is so there was no lemon law! These people will do anything to sell even lie to your face, lie about codes and sell you a car that wont even last a few months! These are horrible people i would not suggest any one to buy a vehicle there!!!