That's shocking news.  That's not far from me.
I'm too old to be worrying about bumps in the night etc. but surely, if it can be discovered who's doing this, a quiet annonymous word to whichever branch of the police covers this sort of thing wouldn't go amiss.  Perhaps the Mossas would be the best bet so the snitching can't be localised.  You don't know who knows who round here.  Mind you, finding out who's doing it ain't gonna be easy.
For what it's worth.