Poor Customer Service

I made a big mistake by buying a vehicle from GM Imperial motors Vereeniging. I took my car after it overheated on 10/10/2019. The car is still under 60 000 km. I always have to phone to ask about progress. I do not get value for my money. Even a person driving a 2nd hand or 20 years old car is far in a better position than I am. I escalated the matter to their headquarters and still no one bothers to call me.