I had a player set up multiple scripts on me on Atlantic tying up items on my vendors. The guy had 3 guys stationed around my vendor locations that were in direct competition with his. I posted on stratics, emailed Messana and paged multiple times. Nothing happened other than, "we're looking into it".
I ended up setting up similar scripts (Thanks to ScriptUO members here...who know who you are) and tying up his items. This went on back and forth for a week or so before he stopped and then I stopped.
I really did not want to stoop to that level but I had little choice. That vendor bug needs to get fixed.
Nothing was done by Mesanna or anyone of the powers that be. Its one thing to script resources, and another to PvP, but to outright grief a player by sabotaging their vendors is in a whole different realm of douche bag.
Fight fire with fire is the only recourse.