Also our bank had some kind of port security so if it wasn't a recognized MAC address, the port just switched off.
And serious company will have this as basic security. It's a fundamental function even available on your consumer grade router at home. While it's overkill for that use, it's basic security for a company.
That's why it's not surprising at all that a bank didn't bother to do that. Banks have some of the most egregious security issues.