Bad service from Discovery insurance

I was involved in a car accident on the 28th November 2021. My car was towed same day to the panel beaters Dent Tech in Rustenburg. The insurance gave approval to them on the 7th Decent 2021. Since then, I've been told that the panel beaters are waiting for the parts from Mercedes Benz. I complained to the insurance that they should move my car to another panel beaters in Johannesburg as I am based there. They're refusing to my request, whilst I don't have a car to drive. I am paying for a car that I don't have and the courtesy car was only for 31 days. For further information I am available on ***, email address is ***.