Bosch Boksburg - DON'T USE THEM!!!

I took my car to Bosch Service Center Boksburg at the beginning of February 2024 so that they could replace/repair damage to my bumper as well as some components around the engine and shock. Its now July 2024, 6 months later and I still do not have my car back in one piece. The manager/owner continues to keep me on a string with false promises and blames others for the delay. At one point I was forced to find the parts myself, collect them from PTA and deliver them to Bosch so they could continue with working on my car. All of this after I had already paid 80% of the estimated quote upfront, and still had to pay for the parts I sourced myself, I then also had to pay upfront for the bumper to be resprayed, which took 1 month. My car now only requires an oil change and aircon re-gas however its been left to the side as other cars have come in and need to be seen to urgently therefore after 6 months my car is still not a priority as Bosch already has their money in the bank. I have escalated this complaint a number of times via calls and emails to the Bosch head office and to date have not received any communication. Wish I knew how to handle this as I'm sure no one would be understanding at this point.