Customer Shouted at and security called

I ordered a fruit salad that came dry, I asked for yoghurt! The waitress quickly rushed before I could choose a flavor! She came with plain Greek yoghurt, I told her I don't eat it because of its bitter taste, she must give me fruit yoghurt! She said its the only yoghurt they serve! I told her I was not aware of that and had no chance to find out as she rushed off!! Another waiter came and told me I must pay for the order as its what I ordered! I asked for the manager who came with the most horrible and uncalled for attitude! She insisted that I pay for the salad and yoghurt! I told her she is disregarding my dissatisfaction! At the top of her voice, around other people, she told me she has been working there since 2006 and there was never a complaint like that, I must pay and leave! They didn't force me to order nor call me to their restaurant, I came by my own choice. I refused to pay for the salad I didn't even touch, they called security and treated me like **** when they were telling each other to count my money for the rest of the order properly to see if it's all there! I was humiliated and treated like I have no money to pay the R50 for the salad! No apology whatsoever!!