Poorest Service from Mercedes Benz Sandton and Rosebank

My name is Macdonald Sihlahla and I’m a 2013 Mercedes Benz C200 cgi Avantgarde owner since 2015. I would like to lodge a formal complaint for the most poorest service I have received from Mercedes Rosebank and recently your Sandton dealership.

Long story short. For the last 12 to 18 months, my car has been having a problem with the coolant warning light coming on periodically. I then took the car to the Rosebank dealership in 2018 when this problem started since it is closest to where I work. A number of tests (or trial and error in my view) were done on the car to establish the cause of the coolant warning light coming on. On all numerous occasions, I was given different reasons for the issue but told that the problem is resolved. However, as usual for the past year or a little more, I would drive the car for a few days, a week or few weeks, then the coolant warning light would suddenly come back on. This year (2020), I think the car has gone back and forth to the dealership(s) for more than 6 times for the same problem, and every time, I was made to pay for the repairs on the same problem. The amount of money spent this year alone is about R266 856. A few weeks ago, I took the car back to your Sandton dealership since your Rosebank office is closed for the car to be fixed as the coolant warning light started coming back on. Today, the 20th of November 2020, the car has been at the Sandton dealership for the last 2 months. A few days ago, i was sent an invoice to pay for a brand new engine. The new engine will cost about R277 000. Yesterday i was told that i must pay a shortfall of about R15 000. This is utterly exploitative from Mercedes given that this problem has not been properly diagnosed by them since 2018 and now i must pay for their negligence. To say the least, I am very upset, frustrated, inconvenienced and utterly appalled by the poor service but mostly the inexperience shown by the mechanics and service advisors when diagnosing and repairing the vehicle. If anyone from the motor ombuds, i appeal for your help on this matter. My contact is ***.