Incorrect pricing

I went to the Game store in Pavilion today around lunch time. I saw a Ryobi Drill marked for R499.00 however when I had taken it to the cashier the total had came to R1400 so I was confused and then was advised that the wrong model of the drill was placed on the shelf probably a customer may have moved it there. I had advised the cashier that it was not my fault and when I went back there I had seen more drills in the exact same shelf so how is Game allowing this? I understand if there was just one drill it may have been a mistake however there were like two. I have taken out photos as well if required. I feel as if Game does not believe in the consumer act. Really disappointed in the service