While I do think there are a legion of bots out there, this screenshot you've provided is rather insubstantial evidence that this/these characters are bots. (perhaps if you provided a chatlog showing repeated 'canned' responses from the same character over and over, and/or a failure to respond to intuitive inquiries like "Where do I train axes on priests?", that might warrant some suspicion)
That being said, you should place an un-redacted version of this image on imgur, and provide a link to that image in a ticket submission in game. It is the GM's in game who handle this sort of thing (not the forum mods). State the name, location, and time that you witnessed it, and probably provide a description of the suspicious activity.