Treat everyone fairly!!!

I recently downloaded the McDonald's app and discovered the deals that I could get from the app. I was quite impressed with this as the deals are quite cheap. I then shared my findings with my work friends and we decided that we will be having McDonald's for lunch today. Myself and 3 work friends then went on our 40 minute lunch break to McDonalds in Cavendish square. We queued for about 20 minutes, got to the till and I was told by the cashier to move aside and tell my friends to move as well as the till she is working on cant redeem the deal. The till that she moved me to was switched off and had no cashier working on it. After waiting for about 5 minutes with no one assisting I one of my friends asked whether someone is coming to assist us and we were told the lady that needs to help us is counting money at the back and wont be long. We then waited another 5 minutes and asked the manager Luwando whether someone is coming to help us or not because the rest of the queue is being helped before us , despite the fact that we have been waiting for 30 minutes to redeem 4 deals. Luwando then told us the same thing , the lady is busy counting cash at the back and will be with us in 5 minutes. We could not wait any longer as lunch break was finishing and we hadn't gotten anything to eat as we were waiting so long. We were shooed to the side as if we are begging for food and not going to pay for it (because we wanted the deals on the app) so that the customers that's actually paying full amounts could be served. This is not acceptable as no apology was given and made us feel as if we were being a nuisance. So we returned back to work with no lunch, nothing to eat, and a very very bad experience.