Verry confused customer

So today myself and hubby went to @Game_Stores in Kenilworth and did some essential shopping. Which includes huggies gigabag for our little boy. So as we take the bag of naps hubbie asks me has it always been 400rand and i say no cause we usually shop at @makro and their nappies are R350, anyway we proceed to purchase it cause we already there. So we get home later the after and i go onto Instagram on to see a @Game_Stores add that says the exact same bag we bought is R360 in store and online from 1 may til 4 may. So now im confused cause somewhere something isn't right.