I don't know if this was mentioned, but have you considered saving his messages or recording him on a voice recorder?
I'm asking because I went thru something similar in my college years. It wasn't my bf's father, but the Dean of Students. This man was a married sleazy manho who slept with many many female students. Although he was quite handsome, I couldn't picture myself being touched by this guy
I won't go into all the specifics, but I will say that after his numerous advances and perverted sexual innuendos he threw my way whenever I had to deliver his mail(campus work study job) I couldn't take it anymore. I knew if I complained to the President it wouldn't do any good since the Dean is his nephew.
One morning I called in and told my boss I had an errand to run so not to expect me on time. I went to Radio Shack and bought a voice activated tape recorder. The guy told me where to place the recorder in order to get a good voice recording. After I returned to work and the Deans office being my first stop, I was sooo ready because I knew I was about to nail his *** to the wall. Sure enough he was as freaky and perverted as ever. He told me what he wanted to do me, where he wanted to do it at and the many acts he wanted to perform on me and how he dreamed of us on his desk

. Knowing I had to keep my cool and not give myself away, I said what would you have me call you if we did these things? He said, you'd call me Mr Big -Blank- Ismeal Blank

I kept saying,"Oh really, what would your wife say"! -He say's,"She knows I'm a freak so don't worry your pretty tight-blank- about it". So much more I could say, but this being the Dis I'll just say it was very pornographic.
I knew after that conversation he thought I would be another notch on his bedpost

, but little did Mr Perverted Big Britches know he was about to get the shock of his life. After leaving his office I went straight to the media room and made several copies of the recording. Hearing his voice loud and clear I knew my misery was about to end. I sent 2 copies to my sister who's an attorney. I sent one copy to my cousin who work for Channel 7 news in Chicago and I sent a copy to my parents. To be on the safe side, I also had 1 copy made for his wife and the city's news station.
Well, I went to work the next day and having to drop his mail off first he went right into his perverted talk. Pulling out a copy of the tape I made, I said "I want you to listen to this song I recorded on the radio last night, I heard it and thought about you all night long
This is how it went from there.
While putting the tape in he's looking at me while licking his smiling lips
He pressed play-start walking towards me, Thinking we're about to get it on until....
He hear his voice. He stops...Staring at me while listening to every nasty thing he said to me yesterday being repeated on a tape....He's still standing in the same spot listening to every word that is about to damn his career. So I kindly sit down. He stomp over to the tape recorder-pull out the tape and destroys it. He starts to call me all sorts of names while threatening me since he thinks that's the only copy. I politely pull out another copy and slide it across his desk letting him know, if he doesn't stop I will nail his *** to the wall and file sexual harassment charges. Also, I showed him the next day delivery receipts to my sister's law firm and to Channel 7 addressed to a well known reporter.
I think he lost a good 10 pounds from sweating like a pig but after all was said and done, he apologized, and he never crossed the line with me again. Matter of fact he never made eye contact with me either which was cool with me.
Whatever you decide to do, I wish you luck.
