Chery Raceview motors Alberton :condescending manager Irvin and Derek

My car was due for service Oct, shortly after service in January i started getting faults of gearbox and engine. I took it to Chery Alberton Raceview and they claimed to have fixed the issue, a day after fetching the car same issue again, car was towed to the dealership again. This week Monday the 17 February i was towed again for the same issue. I received feedback and they told me the gearbox is faulty, next day i was called to fetch my car because nothing is wrong upon complaining they now claimed it's the sensors and they replaced them. Wednesday i fetch the car, Thursday the 20th i got same fault again went back to the dealership i was told i must book it in again. The issue is the manger Irvin is a very condescending ****** person who told me that curtesy car is not a must and that i must not make things about myself! I have lost all hope because i have never seen them treating a white customer so shallow. I have been to the dealership 4 times for the same issue and they haven't fixed the issue, am i too black for the dealership? Irvin told me am not the only customer he attends! Is this what the brand stands for?