Bosch service shocker with motor warranty

I have dealt with Bosch Umgeni Rd to fix a turbo, Very poor feedback. Had to keep phoning Charmaine, they charge 3 x the turbo repair specialists who are not on the panel and refuse to negotiate, after charging to strip and check turbo. I had to pay R399 pm for the last 6 months and R1000 to Bosch to release car which was not fixed after 2 weeks. The owner really needs to jack the inefficient service.... my advise if you have a plan C plan, stay away