False advertisement. Higher price on the cash register than

I wanted to buy a product on the shelf showed for $2 and change, when I was at he cash (thankfully I notice) it showed for $10 and change. When I complain and I mention that by law they should charge me what it said in the shelf. The manager said that i dindt know what i was talking about and that in the bulk burn they can choose to follow the law (What?) I said that if they advertise a product at a certain price they have to honored not charge 5 times more, he get more agitated and said he knows best and I don't know anything and I should look it up. I will agree if was 1 or 2 dollars but 5 times the price plus a bad actitud I left the product. When I was leaving the store (I was at the door) the manager raided his voice from the chash register and said that that i was wrong and that i should checked the law. What type or customer service is that? A manager yelling a customer for a mistake the store make? I will never co.e back to that store