customer not important

@VW the [URL Removed] is not my thing but unfortunatly after the horrible service i have recived it has to happen. On monday the 6th of july i dropped my VW amarok at this dealership with a gearbox problem, car is under warranty and has a full maintenence plan. I explained that i would require a courtesy car as to keep me mobile as i am on the road alot. i was told that problem had to be checked before this could happen. i was later told that the parts needed to be ordered from germany and vw the glen needed authorisation from vw sa. long story short VW SA has told me the part has been available at the dealership since 13 july and was not comimg from germany,so i was **** to by VW the glen, I have been without a car for 2 work weeks with VW the glen telling me they can do nothing to assist me and all i asked for was a courtesy car. work on my car has yet to start and i am left stranded, what is the point of warranty and a maintenance plan i ask. what kind of service is this and how can i even think of buying a third vw amarok when im up for a new car in FEB 2016.