Checkers prices on shelves often do not tally with the price being ring up on the till

Checkers try to consistently ring up prices not reflected on their items and shelves especially the items that are marked down or on special. There is never a time when I shop there that I have to query or disagree with what is being ring up on the till. I'm fed up with having to call management to correct the mistakes. I'm fed up with having to wait whilst they check the shelves and then make the changes. I'm fed up with having to keep an eagle eye on every item being ring up so that Checkers doesn't try take extra money from me.