Ignoring already paid customer

I ordered a Twister and paid cash. I stood aside while waiting for the food so the next customer can place their order. Within the next 5 minutes my twister was ready, but it was not handed to me. As more orders came in they were handed to the other customers. At one point I saw the staff member tapping her fingers on the twister still disregarding the fact that she should hand it over to me. I was ignored and the worker kept taking more and more orders instead of just giving me my paid for food. This went on for about 20 minutes. About 10+ other customers who were behind me got their orders and left. At this point I got fed up of being ignored and had to step in and excuse myself to the next customer before he could place his order. I told the staff member to stop taking more orders and just give me my now old twister so I can leave. She looked at me in disgust and one of the other waiters had stepped in and handed me my twister. At this point I was so mad that I just shook my head and left. Getting stared at by all staff while leaving.