Pathetic customer service

I wanted to buy a sport bag. There was a clear red label on the same shelf stating a price of R219,99. However when I picked up the bag to go and pay the label stated R239,99. I called the lady working in that aisle. I asked her why the red label in on that shelf as the prices differ. She told me no it iz the items next to the bag. However there was nothing on the self except the bag itself. I went further and looked around for anything of that price, but couldn't find anything. I insisted on paying R219,99 as that is how they advertised in on their self. I asked her to call the manager of the store, she told me no there isn't a manager. I kept on insisting to pay the amount they advertised. She called a supervisor, named Bradley, a very arrogant guy. He told me no it is a mistake, but I insisted that I will pay the price that they cleary advertised, I told them that I as eligible to pay the price that they advertised, as it was their mistake and that is what they advertised. I even took photos of their label next to the bag before confronting anyone. As the supervisor didn't want to give me my rights as consumer to pay the price that they advertised, I again insisted on speaking to the manager. Then I was informed they don't have a manager, only a supervisor.

I'm truly dissatisfied with this behavior, because they treated me like I'm wrong while they took my rights as consumer away. I truly feel that this is a form of false advertising, because you could've seen this label from the outside of the shop aswell. I got evidence to proof their advertised price. The fact that there isn't even a manager available for assistance in absolutely pathetic. I'm totally disappointed and shocked by the arrogance that these 2 persons treated me, and I feel this is not acceptable behavior for any employee to treat their customers.