Poor Service excellence!!!

My car came in for repairs on 31 December 2022 at Mercedes Benz branch in Pietermaritzburg, I have had to chase for feedback from day 1. The communication and service has been really bad for me. I paid 70% of what they quoted me for repairs in January, I was told a down payment would be required for parts to be ordered, until today my car is still not fixed. I would actually like a refund and my car to be towed to a more reliable and efficient dealer. Even when I call for feedback they are either on leave or unavailable. No one bothers to call you back for feedback.