Not certificated with their treatment/handling the matter

I bought a brand new CLA 200 AMG at GRAND CENTRAL MERCEDES BENZ MIDRAND in 2016 March 2nd. 3 weeks later the sunroof out of the blue got shuttered while i was driving . the dealership refused to take/ fix the car and they forced me to claim from the insurance. the insurance premium went up ridiculously and it's underwritten by Mercedes Benz South Africa.

When i bought the car they told me that it's on Agility(Guaranteed buy back after certain kilometers/ years) but when i enquirer last month they told me that it's not on Agility, it is Financed. I sent emails and I called the dealership including MBSA with no luck to be assisted. i even went to MBAS personally looking for answers and guidance on how to handle this matter, they send me pillar to post with no direction "POOR SERVICE"