Avoid Bmw Fourways like a black plaque

I got a 2017 Bmw 750li, one of the flagships of BMW. The service I am getting there has been terrible. I want to upgrade and buy the new Bmw 2022 760LI by June this year. But because of the service I have getting at BMW Fourways lately I do not want to deal with them ever. Guess it is time I change to Mercedes S65 or Audi A8 maybe i will get proper service for the amount of money I pay.