Poor accountability of Mercedes Benz South Africa

I bought a Mercedes Benz C180k in 2012 that was still under warranty. About 9 months later I heard a grinding noise on start-up in the morning.I took the car to Sandton Mercedes Benz who couldn't resolve the problem.I contacted Head Office and was told to take the car to MB Rosebank. The car has been booked in numerous time at Rosebank and the problem persists. Leverne from Head office and another colleague of his together with the service manager, Marco had a meeting and I outlined my problem and offered options to Mercedes Benz. To date I have no resolution from Mercedes Benz and am demanding that Mercedes Benz take their faulty product back, as would any other manufacturer, and reimburse me my full expense fro this vehicle. Advice to all, steer away from Mercedes products, once you buy it, all accountability remains yours added with endless headache and out of pocket costs and the inconvenience of not having a car for weeks on end is not optimal, especially in Johannesburg. I post this notice as I received no assistance from MB head office to resolve my problem and the dealer principle of Rosebank has not assisted in any way!