VW Revonia sales lady Mina

I bought a car in Dec from VW hatfield Revonia. But I only got the car in Jan. I drove the car for a few weeks and in Feb it started giving issues. I called the sales lady who assisted with selling the car. And she said I should return the car so that they can take a look at it, and in April they came and took the car for repairs, and it came back on the 2nd of May. End of May the car had issues again, I called the lady again and she telling ke to contact the technician Brian, I din that and he told me that the car has to go for repairs again. I spoke to Mina and she started by not answering my calls and now she is telling me that it had been 6months since they fixed the car. How when the car only came back in May and end of June the car is having issues again. She is now telling yo speak to the manager coz she can't handle the return issues coz I told her that I don't want the car. I'm stuck with a car that is not working and VW Revonia is not doing anything about the selling me a faulty car. I reached out to the manager and he is also not responding