Manager's disgusting attitude

I bought a take away last week at MnB Potchefstroom Mooiriver Mall, of Chicken Cajun with salad, avo and olives. The R13 olives were not in my order when I got home. I called immediately to report, and was requested to come on the day to get either olives and money back. I was unable to due to my work flexibility.

Today just 5 minutes ago I went to MnB, the manager gave me the most ugliest attitude ever, told me how much of an inconvenience I am and I am gonna make their today's cash in short, she ate gum recklessly and bowled eyes at me. I just told her before she serve me attitude she needs to just reassure her staff check orders properly and I don't like her attitude. She rolled eyes, smashed her gum and ignored me completely. I was there to sit again for my meal as I enjoy it, but I am utterly disgusted and will never go back there again. She kept my slip I brought with without reason of not returning it to me because that's my proof of purchase, she did not give it back without reason and how was I to ask it back with such stinking customer service. I am disgusted after being such a loyal patron of MnB, your service is really disgusting because the week before I was there, and one waiter told me my tip of R15 is not enough and I can take it back and see what I do with it. I will never set a foot there ever ever again