Renault Kwid

Bought a new Renault kwid in August 2017 , but already experiencing problems. When I called the dealership I bought the car at (The Glen) they told me to book it in for service which I did , took the car at Renault Roodepoort , same day after the service the car still had the same issues. I called again at Renault The Glen and spoke to the Manager and he had promised to come get the car and sort it out. A week later the Manager still hasn't done what he has promised. I sent an email to him to find out than he called and promised to come the following day which it's two days now and still haven't heard from him. It is so frustrating to be driving a "new' car but having to experience such problems