Ouch - that stings. Know how you feel mate. My previous GTI was a brand new 05 black (and my first GTI), only had it 3 weeks and someone decided to key the sh*tee out of the bonnet - was absolutely gutted.
Never understood keying a car - I mean, if you are going to violate the poor thing, at least have some fun, smash the windows, let the handbrake off and role it down a road - whatever - but keying the paint work? What sick satisfaction does that give?