I've noticed that most of the bots I have observed appear initially, at the entry portals to the main game start points. For instance.. Glenubra house by the fountain. Ive also noticed that the bots mining bosses seem to hang out at lower level quests. I think this may be because they are too weak to progress to a higher level farming spot. In the absence of a software fix , try the tried and true method of rat extermination . Find the hole where they get in and trap it. Set a Dm or GM at these spawn points and kill them there ( Ban , Suspend ..what ever.) Also make it clear in character creation that if you look like a rat you will get treated like one ( Names like asde, sfrgdrg etc.)
Plugging the wholes with a trap ( or hunter ) will not stop the problem permanently , but will help alleviate the flood and give breathing space. When you get the rat population under control and managable, go after the source via code patch or whatever.
Remember that these zones are the entry point for newbies and first impressions are very important,. I certainly don't want to watch a rat crawling off the dinner table
with my dinner