Charged for an extra item

I visited this PnP this morning and bought 20 items inclusive of juice and 2 litre cold drinks. This was for office consumption. I realised immediately when I got to the office that I had been charged for 6 pnp apple juice and not the 5 that I had. I immediately called the store and was advised to come back and bring everything I had bought with so they can rectify. I figured, it will not be cost effective for me to do that since I will have to drive back there (petrol), pay for parking (money), and go to the store and request someone to bring a trolley down to the car and unpack the stuff from the car, pack it into the trolley and take it to the store, have the issue rectified and go back down and repack the stuff which would waste about half an hour of my time all for R15.49.<br> <br> Consumers, just make sure you double check your receipt against your goods no matter how many items you have on the slip otherwise you might find yourselves in the same situation as me :(