Auto Pedigree

About a year ago my wife app**** at Auto Pedigree N1 City to buy a Hyundai Venue,my wife was approved,my wife don't know anything about cars and never test drove the car,on the Friday we took the car from Auto Pedigree while driving the car home i noticed a chip on the windscreen,there was no inside the car,there was scratches on the car,upon applying brakes there was a terrible noise,the following day myself and my wife went to auto Pedigree N1 City and shared my concerns with the sales person Byron,he told me the vehicle are under factory warranty and my policy which i didn't have at the time will fix the scratches on the body,i made them change the windscreen,the sales person collected the car for the brake noise,they apparently skimmed the front discs but the noise on the car is always there upon braking at high speed,i serviced the car at Hyundai and complained about the noise when applying brakes and also about cabin wind noise, Hyundai Somerset West/Strand said it was tyre noise and the cabin noise,they adjusted the door rubbers,i kept on driving with the horrible rumble noise when applying brakes,i changed front brake pads, skimmed the discs but the noise stayed ... yesterday i wanted to fit four new tyres at Tiger Wheel and Tyre Century City and i was told the four Steel Rims are Buckles that's why there are brake noise and the four buckled rims will damage the new tyres,i called the manager at auto Pedigree N1 City yesterday and he was dismissive! please help