Business ProfileforCavender Buick GMC West

I purchased a vehicle from Cavender Buick GMC West along with an extended warranty. I bought the vehicle pre-owned as is, but unbeknownst to me the previous owner of the vehicle had the *** on the car reflashed. This effectively makes the full powertrain extended warranty that I was encouraged to purchase useless for any engine repairs. I bought the car AS IS, but an aftermarket ecu reflash is not something I would have been able to observe while checking out the car nor was it disclosed to me by the dealership. The previous owner of the car confirmed to me that he did have this modification done and he did inform the dealership of this modification when he traded it in. Since purchasing the car I have had numerous expensive issues that I could not determine the cause of, but I now know that they are related to the aftermarket ecu reflash that the previous owner did to the car. Cavender is supposed to be a reputable company and it is very dishonest and shady that the dealership wouldn't inform me of such a major modification. I cannot use the warranty that the dealership ENCOURAGED me to purchase to fix any of the issues I am having because the *** reflash voids the warranty. The dealership also sold me this car without catalytic converters, which is illegal in the state of *****. I did know this at the time of the sale, but I paid them extra to install the catalytic converters. After completing the sale I was informed that the catalytic converters were not in stock and there was no time frame when my car would be out of the service shop. This was completely unacceptable, so I had them refund my money for the converters and give the car to me because I was without transportation and couldn't afford to wait. There was no contract or sales clause over the catalytic converters. I am paying a lot of money for this car on top of the very expensive issues I have to pay out of pocket to fix because of this dealership withholding information from me, this is unacceptable.