Rude Manager

I bought a couple of things at checkers welkom today including Einkendal 750ml red wine which was marked R39.99 but when I got to the till it was R109.99. I asked the cashier for a void, he called the manager, who I was explaining the situation to but he ignored me and told me that we drink too much and that they don't have time to be changing prices all the time. This is absolutely disgusting behavior from a manager as he's looking down at customers and doesn't care what he says customers.