Sounds like the last card they're trying to play... Calling to you face to face?! They know there's no contract between them and STUART G STONE. They bought the debt, it's theirs... Well played :D
I had a similar experience. In the end the guy chucked what he fraudulently tried to pass off as a court document on the floor just inside my lobby. I took the document to the police and asked them to return it to him with a warning of trespass the next time he ever came to my door . The cop agreed the document was not from a court and agreed to return it to the twat with my warning. That was several years ago and he never came back :-)
Anything that comes through my letterbox claiming legal shite and is not properly formed / inchoate is not even good for wiping my arse so it goes straight in the trash. I'm not wasting time on these pricks any more !
i have a similar issue, somewhat worse because i let it laps without replying/rebutting. there is a court case now pending for an attempt to lein the person...