If it were me, personally, I might be moved to speak with a lawyer. If you suffer economic loss and reputation damage as a result of false and fabricated "items" then you may very well have the best way to shut them up, take their money. Slander and Libel are no joke. Of course be prepared to fight with them though. IMHO these are NOT rational humans at all.
Everything out on the net is pretty much permanent record. I'd be doing some screen captures myself, from a library somewhere. Befriend them under a different user account and keep a watch on them for awhile. It's amazing how much better I feel when I don't let the world's negativity get to me. In fact sometimes I like to "play" back a bit and GOOD in-formation is, IME, good.....
Shit is completely out of control. As always just my .02 cent...