The Audi trademark is used on Audi dealers and therefore Audi as sensible organisation should check and influence how their cars are represented. To the average consumer there is little or no difference between "Audi" and, for example, "Blade Audi"
Most dealership staff pretty much plead with you to say nice things to the car company when they call - or at least if there are any problems you tell them first.
Volkswagen can't really push its influence onto the salespeople directly, it would need to go through the dealer.