I don't remember where/when but I know there was a live letter where someone asked about SE taking action against RMT spammers, and the answer was to keep reporting them and include the tell text they sent you so that they can continue to create algorithms to block the tells they send. It's a lot of work, I know, but the more information they get the better.

As for bots, I believe they request we send in character names with times and zones they were seen in.