VW VEREENIGING IS A ****

I took my car in for repairs and paid R4800 then my car came back with the same problem, I then notified them and asked for a diagnosis report which they failed to issue. I took my car back in and they denied that I had booked the car the for the same problem and was rebooked. They finally diagnosed the car and the part came from Germany and I paid an amount of R30000 deposit for it and the car went back in and then I had to pay for the car service which it cost me an additional of R7000. I went to fetch the car and had to pay an outstanding amount of R34 000. After the car came back I started to experience issues that were not there in the beginning and the initial problems are still there. I took the car back in again and now they are saying I must pay R52000 to have it fixed. I don't how they missed the faults to begin with as if you take your car in the should be able to see all those faults instead of the incompetency I'm experiencing.