My bank account (HDFC india) starts with 00. Dare send it to any accounting person who will copy paste it into an excel sheet and bang.. the prefix 00 is gone. Now they will complain that your account details are wrong. Took me a few months to figure out what was really going on.
Here in USA, Citizen's bank, iirc a subsidiary of Royal Bank Of Scotland, has had a bug for years that prevents me from changing my password. The only way to do it is via a series of tech support calls, despite the fact that they've had an open ticket for years. The source of the problem? Can't do it on an account where the email address (not the username) has a less-than-3-character-long name, as in "ab@mycomain.com". I own a small company and setup initials for easy-to-use email addresses, and found zero problems anywhere else in the world. But these clowns seem to need "abc@..." to function correctly.
I've found bankers tend to not be the brightest bulbs in the box, and this is but one example.