the dev's are occupied with the Large PvP Patch (and implementing siege warfare). they'll probably handle this once they have time.
but i believe a dev earlier mentioned they dont have tools to physically fix walls. perhaps a solution would be to "destroy" the wall? and see if its remade in stone. either trying to use your own catapult. if not get another player to siege (once implemented in a couple of days) you on the sole purpose of destroying that palisade.
"Orks is never beaten in battle, if we wins we wins, if we die we die so it don't count as beat, an' if we runs for it we don't die neither, so we can always come back for another go!"