Useless service and car

I am very inhappy about volkswagen south africa. I bought a brand new volkswagen in May 2018 a polo. On 2300 km the car gave me problems took it to a dealer and the radiator was leaking. A few months after that when i took the car for his service the heat valve was changed of a brand new car, on 25000 km they changed a wheel barring on the front wheel. Last week my car would not start it is on 32000 km when it started it had no power at all, the dealership took it in and still no report back on what is with the car. It is clear that the car has some huge factory faults and i cannot trust the car anymore. Now they will fix the problem and what next? This is unacceptable from a new car. It is still under warranty why must i have so many problems wirh this car. Lodged a complaint with volkswagen and a week later no response.