Dishonesty and such an inconvenience

Dishonesty and poor workmanship. I have had the worst experience with bosch braamfontein, The first time i booked my car in for a overheating problem my car came back with a noisy suspension and they promised to rectify the issue. The second time my car blew a headgasket and was promised that it would be fixed in a week.. Its been 6 weeks and my car is still with them. They are now saying my computer box broke meanwhile i drove the car to them meaning it was working fine. I was at the workshop yeasterday for 4 hours waiting for them to finish my car but still nothing. They promised to uber me to and from work for the inconvenience but too my disappointment nothing has happened. I now have to skip work and go there too ask why they haven't lived up too their promise. I might loose my new job because of this. Im extremely unhappy and disappointed