Unfair treatment

I was about to buy 2 packets of sweets which I saw on their pi label the price saying R26.00 when using extra savings card then when I got to the till they were R40 I tolg the cashier that I saw them with less price then she called the controller of which she went and came back with that price of R26.00 then the controller went to call the manager bcos she saw that it was their mistake and I should the price I saw then the manager refused to give me those sweets he went with the controller to that isle and never came back. The controller came back alone when she gets to the till she just subtracted those sweets and said the manager won't give me with the price I saw. So I feel that I was treated unfairly but the manager cos it's not my fault that they didn't put the right prices