Wrong Pricing and Slow Staff

We were at Game in Menlyn to purchase some Swimming Goggles. On the shelf it said R40.00 but when we got to the tills it was R59.99. So I asked the cashier why does the prices differ...she called another lady and explained to her the situation and asked another person to go check the shelf price. Later the lady came back and told a lady working on a calculator to address the situation and after ignoring her for about 5 to 10 min she came and asked the problem. After I explained to her AS WELL she then slowly walked to a manager guy who went to check. After 10 min he came back and said its R59.99, so I asked him why does it say R40.00. He looked at me with so many question marks around his head so my husband asked him if he must go and show it to him so he said he saw the price on the shelf but its wrong it must be R59.99. So I told him to leave it because there were only 3 cashiers working and all 3 lines were so long because of the cashiers that was working so slow. After we turned around and left, they started laughing at us at the information desk. This branch will never see me again because of arrogant unhelpfull staff members.