Worst service ever!

They wanted to sell me a dress which was marked R100 at R140. When I asked why, I was told that on the system it's R140. I toldthem that I won't pay that price as it's not what I see. The lady asked me where I got the dress and I told her, she went and removed all the reduced price tags from the dresses and told me that she cannot change price of the dress cause the manager is on leave so I should come back tomorrow. When I asked her why she removed the price she ignored me. I thought that as the customer you pay what the price tag says....