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Evidently on Messenger you can't remove someone from a message box that they have access to, which suspending them doesn't seem to remove. So basically everyone using Messenger is vulnerable to spammers.
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Although in your instance, I suspect the issue is not so much with Spammers (whose aim is usually financial) but with Forum Trolls, who are targeting your site directly and just want to create havoc. Spammers are reasonably easy to deal with using the UNA AntiSpam module, eliminating trolls usually requires vigilant moderation and individual removal.
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As noted previously: there is no way to remove someone from a messenger conversation in which they are part of. No matter how vigilant you are there is no method to remove them.
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Hello!
We are working on this issues and new update for this issue should be available during this week.