Automatic Transmission problems of the 2012 Suzuki Kizashi

I bought the vehicle in a dealer, the vehicle came with serious mechanical failures which, when purchasing it, asked the owner what problems the vehicle actually had, which responded that it could have a fault in the vehicle sensor, which is normal in vehicles of that brand. . The next day we took the vehicle to the inspection report which showed damage to the gearbox. He recommends that I go back to the dealer and ask for a refund of the money or change of vehicle, since the owner omitted the true fault of the vehicle, I ask him the return or exchange and there was a refusal to return the money and change the vehicle, leaving me with a newly purchased unused vehicle, it was explained to the owner that the vehicle does not pass emissions. The vehicle cannot be fixed since it is a discontinued brand of vehicle and there are no spare parts.