Same spambot program seems to be running on Diabolos as well in the major cities. You have to /blist them on the second shout before they log off. They seem to have recently decided to exploit the loophole that you apparently can't blacklist characters who are offline.
The possible good news in this is that everyone on /busy seems to be forcing the spambots to change their tactics and become more visible (although they will probably step up their abuse of friend and linkshell requests as well.)