CMH Opel in Cornubia dented my car during a service and they are not taking accountability and fixing the dent

I sent my car for service in Jan 2023 at CMH Opel in Cornubia, Durban. And the consultant that worked there reported that they accidently dented my car, at the back, during the service. He committed to calling me the following week to plan around getting panelbeaters to fix the dent. I was out of Durban for a long time, for business, and until I returned (June 2023) no feedback was provided. I personally went there to enquire about an a new issue on the car and then also asked about them fixing the dent. They advised that they have no recollection of this dent issue and the consultant, who I dealt with in Jan, had since left. In June, they advised that they would investigate and get back to me but nothing. I followed up yesterday, 07 August and still there was no resolution or investigation conducted. The new consultant stated that I speak to the Service Manager but he/ she was busy at the time of my call. I was asked to leave a message and they would get back to me. I have still not heard from them. I am deeply disappointed in Opel around this and their lack of accountability and responsibility. I asked them to check on my Car notes for the service done in Jan, but they state that nothing was there. I also asked them to contact the former consultant but they advised that they couldn't. I am now left hopeless in fixing this. I think, 2 days after my service in Jan, I got a call to rate my experience and I informed those people of the dent on my car but till today, 08 August, my car is still not fixed. Please assist urgently.