I'd like to think everyone knows that.
After all it is in the handbook.
However like I said try getting the VW dealership to honour it. 
Oh yeah, everyone knows each and every page from their handbook. 

.
It's not just poor service from VW, this is part of their conditions of sale which they are blatantly swinging around on and sticking two fingers up at the consumer.  
I can stomach replacing worn out parts but rust, ffs, come on this is 2013 not 1973.  
The arch problem has been around since the Mk3 - It's not just the arches either is it; Sills, Boot, Boot badge, Wheel badges, Wheels...  Sigh, why is this a premium brand again?  Oh yeah, the price.