This is one of the few things that gets my blood to boil so badly, that I can actually block out my back pain long enough to throttle those who are responsible.
Jealous swines who can't have what you've got, take their petty anger out on your car, as they are too cowardious to ever confront a person. I hope it's not going to set you back too much to get to have fixed. It's nothing but a royal pain in the backside to get it fixed properly, so you have my sympathy on this one!
Where I live in Oxford, the road our home is one, faces a small brooke and trees, which kids from the local school walk past all the time. When I use to own my E30 Alpina C2 2.5, I was parked outside, under my bedroom window. One night I was some noise outside, as my window is always open as I'm a smoker. I caught two little shits trying to break off the chin spoiler, which is the iconic Alpina signature. I managed to take photos of these little shits and got the police and school involved. Little runts had gotten in trouble, as they kept "granny knocking" on our doorbell, as our front porch, finishes right by the road, so they could keep pressing it and running off, until one day the local police officer connected to the school caught them in the act and they got in a heap of trouble.