One way of extracting automotive revenge
It seems that a UK Range Rover Sport buyer was so tired of having is SUV repaired that he applied vinyl stickers to the side of his Rover detailing all of its problems and parked his ride in front of the dealership.
This is a time honored tradition. I remember reading of a disgruntled Saturn owner parking his car in front of a Saturn dealership with big "Saturn Sucks" stickers.
Given that these cars are parked on public streets, there isn't much that the dealer can do provided that the owner abides by all parking restrictions. Of course, they could try to make customer happy, but sometimes no compromise can be reached.