Cashier grabbing clothes for sale from my hands

We arrived with my daughter at Pick n Pay Clothing Vall Mall on the 16th of June 2015. I heard the security saying that there are pants for sale, I quickly rushed and took 3 of small size, to my surprised the cashier who's name is Moselantja came in a rush and grabbed the pants in my hands and others left on the rack and hid them. I kindly asked her for the pants and she told me that she wont be able to give them to me for no reason after a while she tells us with a revolting attitude to come back on the 22nd of July 2015 although their on mark down and other customers have brought them.. I'm very disappointed because this is not the first time. Workers there wont even bother to help you find something even though they can see that your struggling to get it. I'm fed-up with the attitude and wont bother myself to go there.