bad experience at super spar

Being month end, queues are long in all retail stores. After following a long queue at super spar(gateway shopping centre) - express till, I reached the counter and the cashier ignored my presence and shouted out for the next customer. After gaining her attention, she then insisted that I had skipped the queue and then continued to tend to another person. Being highly upset, I then asked her to get her manager to which she ignored me again. I then proceeded to put the barcode of my one item in front of her scanner, forcing her to get her manager and making it possible to go ahead with my purchase. Unfortunately, I tossed my reciept out of anger and didn't get her name, but this should not be happening at a big company like super spar. Firstly, this particular cashier was arrogant and had a terrible attitude and I feel that super spar should put measures in place to prevent such situations in the future by creating a more organized and controlled area for customers to queue. Lastly, I would like to end my complaint by asking how could the cashier come to the conclusion that I had cut the queue, when she was obviously focusing on her job by tendering to the person ahead of me.