Pathetic service rendered by Mercedes Benz SA

My car was on agility plan went in the end of May. This car was bought in Menlyn and I stay in Cape Town, it was a real nightmare handing the car back. I told the dealer that my number plate is personalized and need it back for my new car. I was told Mercedes South Africa will sort everything out..After months calling the call centre dealing with more than ,6-different agents Promises and lies where made Telling me I must just go to the traffic department my new dealer went 10times I was told its in dealer stock I'm very frustrated with the call centre I will sit up to an hour In the phone. Up till now the manager has still not called me My new car had to be register with another number All I ask that you return my license number and have a senior manager call me