Unless there's something you leave out from your story, I find myself in an agreement with your case. They warned you and you asked what's allowed and what's not, and then what's allowed [in a written statement] suddenly became not-allowed. I can understand that interdepartmental miscommunication are something that frequently happens, and though the above situation can be considered as a poor communication between your host and the security team, their decision to lock you out seems... wrong, especially if there's nothing wrong with your KYC and you do everything honestly.

I'll write to BC's representative, though my previous PMs and the past [active] cases against them are not solved or attended yet. Please update us if there's any development from your side.