Nando's Ruimsig Bad Service

Placed an order online for collection. Estimated time for collection was 15mins. I collected the order 30mins later at Nando's ruimsig. Was assisted by a chubby fair skinned lady who then dismissed me at the collection area and asked me to stand in line with everyone else. I emphasised that I had placed the order online it is just a collection. The reason we take time to order online and call is because we are trying to avoid waiting long. It does not make sense that now I have to queue with everyone else when I made my order in advance. She dismissed me and said "Well that is just how it is. If you have a problem take it up with management I do not own a Nandos franchise. That is very bad customer service and not a good way to engage with customers!