That bloke sounds like a right horrible !*!@# Mr Darn... but really, could it not have been him who put the note on your car? If he's damaged it before and he's jumping out of bushes at you (He sounds crazy) then I wouldn't rule him out to be honest. I honestly think that whoever it was, you will know them. Anyway, I hope you get it resolved as it cant be nice having stuff like that happening.