south chicago dodge sold me a 2005 cadillac cts that had a non factory alarm system on car that never locked or unlocked open truck but it lock my engine and now my car won't start at all.. chicago Illinois

I'm writing this because I brought a 2005 Cadillac CTS on 2/08/2014. I only had the car for five days on 2/14/2014 my car stop working. got off work that day and my car would not start up put the key in the ignition turned it to start and nothing happen tried everything to get it to work. I called a lock smith they came out tried reprogram the key that didnt work made me a new key it still didnt work after paying the locksmith $200 for nothing ,  the Next day I had it towed to Elite auto repair my car been at Elite auto repair now since 2/15/2014 and still there they are trying eveything but still the same out come my car won't start. some type of anit lock system is on and thats what stopping my car from running.