Postnet Gallo Manor (Morning Glen Mall)

I recently went to postnet at Morning Glen Mall in Sandton. I believed that the price for a postnet to postnet was suppose to be R99 and every KG thereafter should be R20 extra. I had 2 boxes 1 weighting at 6.7KG and the other 1 at 7.9KG. Which was suppose to be R298, instead I was charged R456.

This was a shock, I will never go this postnet again and I hope no one goes to them ever again. Totally bad service also from the shop assistance.