If u wanna be Inspector Gadget, then go ahead and use secret
cameras, or can hide behind pillar and do filming yourself.
If not lan lan.
I have been in a similar situation, but ended up letting it
slide. Although I had some fairly drastic measures in mind, I ended
up accepting that it was just a car afterall.
Though, if I saw the person doing it, I would have
confronted them in person.
So to answer your question.....maybe keep a lookout one day?
no matter what , i will die die gather evidence , and report him to
police , no matter how much money it cost me.