I need help, I am disgruntled their service is very poor.

I am driving AUDI A4 I.8T, I towed my car on the 14 October 2019 booked for it on the 15 October 2019. Its problem when I was starting it showed Parking Brake Malfunction.

In their diagnoses these are the things they ordered bulb ***, Manifold, 8k2 721 401h cylinder bin m2f2, 000979 940 connector, bin m1c1, white 001 666 pin. I paid an amount of R28000.00 then. On Wednesday 13 November 2019 I drove the car again because its still having same problem, on Friday 15 November 2019 I experienced same problem, meaning that the diagnose was not correct. I am stuck with the car showing Parking Brake Malfunction, I need your help, seemingly they are fiddling in East London. On Monday 18 November 2019 I will be sending it for the third time. I need help, I am traumatised when I will be starting the car because I don't know whether it will start or not, I don't have confidence in East London anymore now.