Bad customer service and incorrect pricing at Pick n Pay Protea Glen mall.

I went to Pick n Pay today to buy purchase a multi plug and the plug was priced under the amount of R179, when i got to the pay point i was charged R299 when I paid. I questioned the amount and was told that that amount was incorrect. I needed the plug and had to take it for the amount that was not advertised. I'm not happy with that. The service was not good and it seemed like they couldn't wait for me to leave.