I have no idea why you havnt tied him up with gaffer tape to a chair.
Waved a sharp implement in his face.
(Its very threatening, and yet obscurely sexual, and as he has an obsession thatll get his attention)
Cut up the phone line, and threaten to do the same to his face.
(But not, as you don't want to be arrested for GBH!)
Then leave?
I swear to the good God that's what I'd do - COMPLETELY wrong, has the world gone MAD?