Raw deal at Rage store

I was at Rage Louis Trichardt yesterday and wanted to buy a sandal that was on sale. The sales lady took out the box with the size I required and opened it. there were two sandal inside the box. I took the right foot to fit one and she walked away from me, while I sat down to fit the sandal. I then called for her to tell her I am taking the sandal then she said there is no partner for it and I cant have it. She said there was a mistake and the box came with only one sandal from the supplier. I know for a fact that there were two sandals in the box when I took one from it. because I specifically asked for the right foot and saw the other one still in the box. I chose not to put up a scene and left.

This is so unprofessional and rude and may cause me never to buy from Rage again. Is there anything that can be done for me to get the sandal?