I'd say just stop this and other threads regarding issues with md2020.
He's obviously reading these threads and is virtually pissing at your legs...don't give him a laugh every hour.
I don't have anything with him but I dealt many times with others that were in the same mood so to say...I used to be a car dealer many years ago...
Always the best was to stop every communication, because these people just don't want to communicate...they want to provocate, escalate, laugh at you...they feel powerful the times you get angry at them, they don't think you are willing or even able to harm them in any way.
So stop communication in every way, set up some legal action and wait...
Most likely you won't get back your property but that's not different from the point you guys are right now. I sometimes got back my property once a lawyer wrote them or the police was in place...at this moment they don't feel powerful or big anymore...they are what they are...small, anxious, poor little manikin and sometimes they realize it...