McDonald's Richard's Bay bad service

I went to McDonald's in Richard's bay to buy a Big Mac meal and I realized that they had only given me one tomato sauce sachet. I asked for an extra one because I like my ****** and chips spread with tomato and the lady that was serving me refused and when I insisted she called the manager. The manager said I needed to pay 50c extra for one sachet. I was upset cause this was the first time I have heard such, I have been to lots of McDonald's and I have never heard such. I was ready to cancel my order since McDonald's is a franchise you will expect consistency in all of their store regardless where I buy. In summary the manager said she will take the 50c out of her salary to buy me the extra sachet. I am sorry I will never go to that McDonald's