Worst customer service

Bought a used vw polo gt in 2018 June at mercurius polokwane, within three weeks of purchase i returned it as it was making funny noise on its suspension, they took it for repair and informed me if it does continue i should bring it back, after six months when i return it as it still does samething i was told its no longer their problem since six months passed, now i am driving a car which can break any time and also paying it as it was financed by a bank. Never had any joy with the car and their service