Poor treatment and harassment by Markham Sammy Marks Square

I badly treated and harrased by an illiterate sales person at Markham sammy marks in Pretoria. I got into the store he came running to check if I needed and I said I need help with the sizes as I couldn't find size large of G star golf shirt. He went and got the size for him. I went straight to the cashiers to pay and put my plastic bag in my laptop bag and left the shop. Few minutes later an idiot came running demanding to see the T shirt. I took out the plastic and the receipt and show him. Instead of apologizing he just left me at woolies without saying a went hack to the store leaving suprised and embarrassed with the woolies security guards looking at me as if I'm a ********. I went back to the shop and demanded to speak to the manager, I relayed the incident to her but she did nothing