I'm sorry the OP had the experience of once, years ago being told it was okay to use the bathroom, and the rules then changing years later when they had to use that bank's bathroom again, but policies do change. I think the message / lesson to be learned is that many banks don't have a public restroom due to safety policies put in place, and that next time, it's better to find a mcdonalds, public library, grocery store, or something of that nature. Also if a stranger knocked on my door and asked to use the bathroom, I would not even open the door for them. That's me being safe, not cruel. I do hope that the OP feels better, all the same.