It reminds me a long time ago of going to a favourite Chinese restaurant in Benidorm, we were a group of 9. After a very pleasant meal we asked for the bill. One of the party, she always scrutinised the bill wherever we went

She came up with a statement that knocked us for six!!!
The items and prices on the bill were all correct, but the final amount was was WAY above what we had ordered. We were all incredulous, thinking she had a few vino's too many, so three more people tried to make sense of it. Effectively, the till had obviously been fiddled with (don't ask me how!)
A young couple near us decided to check their bill as they said their bill was much more expensive than they were expecting.
We obviously called the owner who replied it was impossible, mmmmmmmmm we said, either you add each individual item in front of us BY HAND, or we would call the police.
He hastily apologised, and accepted the correct amount, as he did with the young couple.
One of the group did report it to the police, with the bill as proof! funny, the restaurant closed down a few months later.