AFK auction bots

How do you stop AFK auction bots? It gets really annoying when level one characters with randomly generated names pop up, and undercut you every time you put an auction up for weeks on end.

They're easy to spot. It's always a level one with a random name. They stand in the exact same spot in the AH. They never log out for days on end, yet they're always AFK. When you do see them move, they take the same hopping path to the mailbox. If you try to post anything, you'll be undercut. Post the price too low, you'll be bought out, and the price will go back to the default high they set. When one goes away, another one pops up the next day.

So, my question is, how do you report this, so that the GM's will actually be able to catch them in action? Trust me, it's not hard to spot an afk bot in action. Getting them with a full inventory is probably the only way to stop them, and restore whoever's account they hacked.