Wrong Pricing

At SHOPRITE GOLD SPOT VOSLOORUS I was unfairly treated by the cashier and Manager named Sam and I'm not sure if its his real name because he didn't have a badge on him.

I was going to buy a parmalat cheese which was wrongly price and I went to the till to pay but it was higher and I spoke to the manager Sam and he said I should use my brain to think a 400g cheese can not be R25 but they put that price on the cheese. He was rude and even pointed me with his hand and walked away.

Worst customer service I felt like a fool since he said I must use my brain but it was the shops fault for putting the wrong price. I KNOW MY RIGHTS AS A CUSTOMER.