The only other time something like this happened was a couple of years ago when my oh went to the bank counter to get some cash out, he wanted all my wages out as it was 2 days before Xmas so he asked for £240 the lady gave him it, but instead of withdrawing it, she paid it in. So he got £240 cash, and the original £240 was still in the account PLUS an extra £240 that she paid in!! We didn't notice till the next day, needless to say we withdrew it pretty quickly lol. Nothing was ever said about it so we gained £480 that day, Xmas eve! Merry Xmas lol