Sold defected motor car

I bought a golf 6 gti from them in October 2020, I’ve done less than 5000km. To be told that the engine has basically seized due to defect parts put into the car. Also advised Willie the sales guy that the roof lining was coming down at the time, he said there is nothing wrong! I would never ever buy a car or suggest to buy a car from them ever again! To date car has cost me R36k. They are professional at taking people for a ride. I know of other who have experienced the same.