Cost of shipping is ridiculous

i recently bought a Wagworld K9 camper bed (large) for my dog. The package weight around 4.5kg and I paid additional shipping fees of R65 which i was happy with.<br> <br> I am now trying to buy another dog bed (wagworld Wagworld Nookie Bag Dog Bed) with a weight of 400g (according to your website). The price is R251 so should be free shipping, however, the website informs me that it is economy shipping and I need to pay an additional R127. Please explain to me why i need to pay almost double for this item that what I paid for the K9 camper? Even the dimensions are smaller. K9 camper is 85cmx70cm and this bed is 48cmx55cm.<br> <br> There are clearly major problems here. For interest sake, i looked up dog food on your website: Zogo Chicken Flavour Dog Food 8Kg (dimensions are 50cmx40cm) so very close to my item in dimensions, but 20x heavier. No \ECONOMY SHIPPING FEE's"apply. Only the 20kg bag (60cmx50cm) has \""economy shipping\"" at a cost of R110 (so it is bigger"