What, he books some of your regulars, is a no show and then just rants about you in their feedback?
As an aside, on AW, does the girl not have to confirm the booking happened before feedback can be left?
In all seriousness, I don't know your personal details, but it hasn't sounded like you are married and have a family. I also don't know your work situation and how delicate it is, but if you have little to lose (apart from a bit of face) I really think it is time to get the old bill involved if you feel comfortable doing so, because this shit is nutty, would make any reasonable punter nervous and has gone on long enough.
Of course, there is the fact that other people would have to give evidence who may not feel comfortable doing so, and I'd totally understand that. It is not for anyone else to put a WG in that position.
This is fucking sinister though.
Best of luck Hendrix. I hope he gets his soon enough.