First step to do..?

Some know my first and last "no review" was a fake from a loser stalker guy I no longer wanted to see
Well yea he's back harassing me from different numbers claiming he's about to post another fake review on me soon
He contacts me from different numbers daily attempting to set fake appointments and it's a freaking headache
What should I do first to avoid any further defamation on my behalf here?

Put him on ignore and do not respond.

That's been done unfortunately
But he said he has new number so he'll be getting a new handle to make the fake review;/
That's the psychotic part

Now wondering what mods will help me so I can forward the proof to this fake review I started would show ahead of time!! People must open they're eyes here omg