*********** and rude staff

I was @ clicks lifestyle center in centurion yesterday buying pampers nappies that are currently on promotion when I got to the tills it didn't discount, so I tell the guy that was helping me(his name is Obakeng ),that this nappies are on promotion cause I brought them few days before @ Centurion mall, he rudely dismissed me saying only on promotion if you buy two ,even when I explained to him @ the counter that he must read the promotion carefully, he rudely said that the is no way I can override the system, even when I told him to call his manager he still insisted that it like this and the no way they can change it only for the system to update to what I being saying, he did even apologize for his incompetence, so I wonder what kind of staff does clicks hire ,so *********** and rudely, why put I discount if even your very own rude staff can't interpret it, sho I got I shock,he didn't even call his manager like I asked, so pity cause lifestyle center is the closest to me, but the experience I had there yesterday is disgusting, Obakeng not only is rude but he doesn't even want to listen to the customer, he argue with something that is written by the store it self