If you can, get screenshots of these people (get them both or however many there are) doing their impersonation, then email all that to support@spacetimetstudios.com

I find that sometimes when I use the report button, they don't seem to notice the time/day I reported -- I get an email back once asking when the incident was, etc. So now, for something serious like this, I use screenshots plus the date and time.

See if you can do that or write a more extensive email w/ the names and dates and times of the incidents.