Pick 'n Pay a *******!!!

I've purchased a 1.5L Pick 'n Pay fruite juice blend a week ago at Pick 'n Pay Hypermarket Ottery. To my surprise after going through my till slip when I got home, I saw the scanned price was R51.99. I could remember then on the shelf label it stated the juice was R20 odd. I immediately went to my fridge to see whats so special about this mango juice. After looking at it for a while I saw it had the label on of a 3L juice instead. This is a total *******!!! I was actually getting half of what I paid for. To top it off, the milktart (decorated with these xmas bells) had mould spots on it. After calling to the store to complain, all I was told to return the juice and milk tart to the store and they would refund me. I was so furious by then and sent an email to the customer service head office. Who was going to refund me for my fuel and time??? The stores are chaotic already as it is.