Bad service at imperial select cape Town.

I brought a car at imperial select cape Town and the service was really bad, my car bornet showed that the car was not fine but they assured me that they did a hard job on it, but few months later the car started making funny sounds on the wells wen I turned or reversed the car. At that point in time it was deep in it, then boom when I took my car for service of 75000km they told me I had to bring the car back so that they can start it from scratch, how was that possible because the car is still in good shape? And I didn't receive even my spare key for the car, from the start the consultant was in a hurry to sell me the car, he took advantage because it was my first time buying a car. Tried many times to raise my complaint but nothing till this day, I am not happy at all.