Accident cars been hidden n written off cars

I bought a car on the 04 October 2019 following day the car doesn't wanna start the engine the dealer Ken does not wanna handle the problems while he didn't give me car papers since he was hiding the car is written off and the car was recommended by webuycars.co.za that's why we got interested not knowing we getting scammed even the price we agreed keeps changing all I need is cancelation take the car back since it's not working. History car not told