Mercedes Benz South Africa

I own a Mercedes Benz GLC43 AMG 2018 edition. I do not have the car for even a year yet but Mercedes Benz cannot find the fault in my car. They have the car for 2 months now and they cannot give me any fees back nor can they replace my car. They had first told me that it’s the gearbox and that they will need to replace it from Germany, once they received it they took another 2 weeks to sort that out but they still seem lost as to what the problem is and I have sent numerous emails and called daily but neither the dealership nor Mercedes Benz South Africa is willing to help and assist me. Upon purchasing an expensive car, you would think that the service would be up to standard but Mercedes Benz is unprofessional and have no way of dealing with service and client care.