Hyundai George refuse to assist us after selling us a car which broke down 3 months after cash purchase

We bought a Opel OPC from Hyundai George in August. In November the car start leaking oil. We asked the salesman what was wrong with the vehicle. He assured us nothing was wrong with the vehicle. He refused to assist us. We took the car to the local Opel dealer. After inspection they found that piston 1 and 4 had low compression. They also found that the turbo was also packing up. Leaving us with a R89000.00 repair on the vehicle. We paid cash for the car. Now Hyundai George want nothing to do with assisting us.