false adverti*****t

So I get to TotalSports Forest Hill Mall take the Nike Sneakers that I want and ask the lady (Precious) for a size 3, she gets me a size 3 and we go to the till as I'm about to pay I ask her what is the prize of the sneakers. she tells me its R699.00 when she scans the box her computer says R749.95, after a back and forth argument with Precious and the manager. The manager says i should pay the price that they on their side or else... TotalSports Forest Hill Mall or their consultants are trying to make sales on false adverti*****t.