Yes many times. For some reason the prices on the shelves don't always ring up as the price & or sales price. You have to be watching the screen when they're scanning your items. One man I know got charged like $90 I think for a pork loin once. He went back and the refunded his money.
Bring it to their attention. I always do when something rings up more than what aisle tag says and they always fix it. Most people don't pay attention.
No but go to office and show them
It has not happened to me, but I could easily see it going on.
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