Renault kwid you never fixed

I received the most poor service at Renault Tygervalley cape town, I booked my Renault kwid 2018 which was overheating and asked them to check and fixed the car, I had to constantly email and write to them on the progress of the car with no communication from them, they kept on changing parts with overall costed me around R11 000 but still the issue with my car still persist and it stayed for a whole month with them....I'm frustrated because I paid them R11 000 but my car is still having the same issue and was never fixed by them