Misrepresentation, Non-Disclosure & Bad Service

I bought a brand new Renault Kwid and had non stop problems and no assistance from salesman Thabiso and Manager Dilshaad. Problems range from faulty brakes, they refused to give me a courtesy car and expected me to drive with my family with faulty brakes, faulty acceleration pedal which was never fixed and battery lasted only a few months. When asking for assistance to replace the faulty car I was avoided for almost a month, when I eventually went to the branch (Brackenfell) because they would not take my calls, I was told they not going to help me. How can you sell a car with known problems and not disclose it for a sale (workshop confirmed all of these are known problems) and then refuse to help when brought to light. I have been patient and reasonable for almost a year, but enough is enough.