Rude Supervisor Threatened to Cancel My Purchase

I had a bad experience at Ster-Kinekor Cresta on Saturday, 27th April. I go with my 3 young kids for a much needed movie after being too busy for movies and braais for 3 years (I was studying for my MBA). Obviously, the kids are over the moon excited at being with their dad. I go onto the self-service machine and buy 2 small combos and 1 regular combo for the kids and get myself just a drink. When I get to the serving counter, the staff member serves me just the 2 small combos, a regular drink + popcorn and my drink. No tray and chocolate for the regular meal. I tell him what I ordered and he rudely tells me that that's not what my slip says. I tell him that I know what I ordered and I was sure I didn't order loose items on the regular meal.

He then called a female supervisor who did not believe my story and just told me that she will cancel my order including the tickets. I asked her whether that means I would get the refund immediately and she says "no". FYI, I have had a previous time where it took over 8 months (not joking) to get a refund for tickets due to a cancelled movie show due to load-shedding. I asked her how fair it was that I don't get a chocolate bar when that is what I paid for. She says there's no way she'd give me a "free" chocolate and that she uses the self-service machines so she knows "they can't miss something that you order". I told her not to cancel the order and by now the kids were irritated. Well, one of the other staff came and checked the slip and saw that the chocolate bar and tray including the total amount were printed upside down. Instead of saying sorry that supervisor just walked away, served me the regular combo and disappeared. This really bad customer service and nearly ruined was supposed to be a wonderful afternoon. I don't know how such behavior could be tolerated. I'm very angry and would like this issue dealt with. I'm expecting a proper response from a representative of Ster-Kinekor.