Deal with it IC, by whatever means. Find and kill the guy, then buy his ship from the market. Wait for combat and forcibly gain access to the ship so you can retrieve your assets. Or have Zeek Milos give you access to the ship. Sure, that may require contacting him by other means and getting him to log on, but that's your problem.
The Admin will not step in to deal with this, regardless of the activity level of those involved.
"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."