There was an item on...

There was an item on sale with a red sticker and as I went to pay for it the teller said it's not the price that's on it, I then told her there's 10 pairs of glasses with the same sticker and price and she called the manager who then said I will need to pay full price as it's not on sale I insisted to pay the price I saw it for and she refused being a store manager and was unhelpful and unpolergetic about it