VW Mastercars are *****,selling damaged cars

I bought a car in August 2018 at VW Mastercard Menlyn.upon collecting the vehicle I did the necessary inspections,however a week later,the vehicle starting giving problems,the radio stopped working and there where warning lights coming on. I called the consultant who sold me the car,it took him 3 weeks to come back to me,eventually I got hold of him and I explained the problem.they took the car in and a day later he told me there was nothing wrong with the car,I explained that he needs to check the coolant and ensure there is nothing leaking,I also told him that when I drive a distance of 60Km,i get a warning sign telling me to check the engine and coolant,but that was NOT done, I showed the consultant that they sold me a damaged vehicle,he didn't even look concerned,and now the problem has become to serviour that every 5km or when I start the car that warning sign beebs.now I have to spend another 10grand to get that sorted because a leaking pipe in the engine.??????.I thought MC sell undamaged used cars because that is VW policy.BEWARE!!!!!!,make sure you check everything,under carriage,sides,bonnets, in and out before buying MC vehicles