"Unorganised misadvertised no communication "

I arrived at the orthodontic a and e at half 8 in the morning, very aware that it was a first come first serve service, where I was given a slip to say that I was sixth in the queue. Come 10:50 I still had not been seen and I asked the receptionist how far up the queue I was in response they told me it was done on a case by case basis and they were doing long cases first. However, 11:20 comes and I see now that everyone that had checked in after me had then been seen. It is so frustrating and completely pointless of me to come in so early when everyone that had checked in after me was seen before me. Needs better organisation and communication. It's especially frustrating as the thing they needed to fix for me took 5 minutes. I was one of the first people in and last to be seen. I was finally seen at half 11 and the Dr that saw me said there was a mistake and they thought I had been seen...