OUCH!!! That looks like a bum print all right. What cretins!! It's starting to sound like someone might have it in for you (and/or your car).
What would be so bad about telling your parents? I don't know what your cash flow situation is like, but maybe they could help defray the cost (especially because it's getting more and more expensive as time goes by). P;us, I'm not sure how they're not going to notice a big bum dent on the bonnet.
I hope you get your car fixed soon, but more importantly, I hope you catch the fool(s) doing this!