iStore pricing

There is a big **** on pricing of their items. I bought a charger at their store in Mall of Africa and paid R399.00. Three weeks later after misplacing the charger I went to their store at Cresta and bought the same charger. This time the charger was R400!!! I challenged this and was told that was the price in a take it or leave it attitude. There is a big difference of R100!! I was very unhappy and as for the future I will look at other replacements for any iStore product as they seem to be cheaper than iStore original accessories.