Poor customer service

I bought at a car at Hyundai Cresta. The car drives and fine. The customer service is beyond poor, it's horrible. You need to beg and chase them to assist you and top of that still give you a bad service from the sales person to the manager, since been dealing with them , got a bad customer service all the way. Three months down the line, I am still waiting for a part that suppose to come with the car. When I go to the dealership it's either they give wrong stuff or they just don't have it. I have been driving 20km three times to their dealership to receive poor service. To finish it, Hyundai south africa customer care, got no assistance beside sorry it's not Hyundai SA fault but dealership and can't be hold responsible. Which car are those dealerships selling. I guess, they must just ask them to remove Hyundai branding, so that we know we drive no name brands. I won't recommend anyone to deal with Hyundai. Unprofessional and don't accept responsibilities or any accountability.