I just withdrew £2800 from the bank. Looking at my online banking, there is only a withdrawal of £2000 listed. The form I signed said the amount I asked for, and the teller weighed the cash out on the scales to show the true amount, so my best guess is that she typoed it when entering it into the system.
Presumably this will be noticed at some point since the amount in the system is different to the form, but what are my obligations in the meantime? If I put the "missing" money in some sort of high yield account would I be able to keep any interest accrued? Should I inform the bank or let it slide until it is noticed? In the unlikely event that it's never flagged up, would not mentioning it be theft?
I phoned internet banking yesterday as I couldn't find a direct number for the branch and couldn't make it back there before it closed. The helpdesk guy seemed a bit confused at me reporting an error in my favour, put me on hold and eventually came back to tell me he couldn't do anything from his end but would put a note on my account, and that I should tell the branch in person. I was also told that I was very honest and that I'd made his day as it would give him something to talk about.
Update 2 It's all worked itself out. There's a reversal of the £2000 transaction and a new withdrawal of £2800