Mercedes Service stinks buy another brand

I called this dealership last week to book my car in. All the people in the booking department were busy. The receptionist took my registration and promised that I will get call back. I realized today that I did not get the call back. Tried calling them this morning and their lines are never answered just rings. On the 6th attempt the receptionist that answered said she will transfer me TJ the manager after I complained. While waiting to be transferred I got disconnected. I tried calling again 5 times and it just rings. These guys moved to fancy new premises in Sandton but their service stinks. Clearly they doing very well and don’t need clients. Will go elsewhere. Should have never bought a Mercedes. No wonder other brands are selling more cars in South Africa