RMT PM spam

[Laf]

System >> Support Desk >> Contact Us >> Report Cheating >> List your world, zone, date when RMT whisperbotting occurred, add character's name, copy and paste their message under Details.
It's a bit cumbersome, but our options are limited at present.

And wait days getting spam from very same bot? WOW, the information you provided is sure useful.

can't help with the removing, but as far as adding:
macro:
/r GTFO!
/blist add <r>

click left mouse button on players name in chat window -> blacklist