I think here in Munich Volkswagen/Audi/Porsche Zentrum Munich are still working together as a group (former MAHAG).

My company owns several cars (Volkswagen Group) and the CRM software used by them is quite annoying. Even if someone (private/company) has more than one car there is only one telephone number for each owner. Not very professional if your are not in Europe and somebody gives you a call in the middle of the night to tell you that "your" VW is ready because they forget to change the mobile number. The Porsche service isn’t better, several times I received a call by my colleagues that Porsche had informed them that my car is ready.

They used the same 24/7 gate to drop or get your car, but maybe this has changed this year.