I work for a large financial business and although I'm super nice to customers I have some real bugbears for example.
Me: Thanks for calling 'your bank' can I have your sort code and account number
Cust: oh I didn't think I'd need that (huff & puff), I'll just go get it 
Cust: I typed my security details in correctly and it's blocked me I definitely typed them correctly there's something wrong with your system, your bank always does this I want to complain.
Me internally: am no everyone makes mistakes and you typed it wrong ffs just like you done last month.
Cust: you've blocked a large payment I am so angry about this etc etc
Me internally: ok in future if you get scammed or hacked we will just let them take large payments ok brilliant.
How I understand people can be fed up with things the lack of common sense pickles me.
Me: can I have your account number
Cust: reads out card number
Me: no your account number
Cust: is my online Id ok
Me: NO Your account number
Any bugbears from your work place.
Or if your bank is annoying interested to know.