If you recorded the easement transfer when you bought it with the proper legal description on the recorded deed and that legal description was correct, then I believe there may still be a need for a “quiet title” action if it was never properly transferred to your plat.
All I’m saying is there may be some confusion with your lawyer as to who is the legal owner of record of your lot, even if you recorded the easement transfer.
Is the “rogue user” the new owner of the property adjoining yours or a tenant of the new owner of that property?