Another anon here - no comments yet, so maybe, like me, other readers had no idea what a Blessing Loom is. I assumed you where in Lancaster, PA or somewhere. So I looked up the term. In short, it's a Ponzi scheme, it's a scam, it's a crime.
I'd print this article and hang it in your break room. Maybe email it to staff if you have multiple locations.
http://whnt.com/2016/11/21/blessing-loom-money-making-venture-good-idea-or-a-twist-on-an-old-scam/As far as saving the whole bank's customers, maybe, with an emphasis on "meh." You can't save people from themselves, especially when greed is blinding them. Still, maybe post a statement message, post it to your social media feed as a tired old scam, etc.?