Bad Service

I took my car in for a minor service on 26 July 2021 at Bosch Service Kempton Park. Since then my car shows a service light every 1500km traveled. I took the car back at least 3 times since then. And the problem still persist. I have been wasting my petrol and time to try and get the same problem fixed for over 8 weeks. I'm beyond unhappy with their service.