"Ignored"

My appointment was 2.10pm, I got there at 1.55. Gave the receptionist my completed info form, she bade me take a seat. There were 2 people/patients waiting already. Over the next 15 minutes those 2 went in and 6 other people/groups sat down. I thought I would be next, but 1 by 1 all six people/groups went in in front of me! I approached the receptionist and enquired if I had missed my call (I knew I hadn't, but this was the most polite way to say what's going on!) it was now 50 minutes I'd been waiting, she said I was early but yes I should have gone in by now, I said all 6 groups had gone in before me, I couldn't believe it when she then said, "yes but all their appointments were before mine" ?? I said "so you don't have to be ontime, you can be late for your appointment then!" she said "just a moment" then disappeared through the doors, came back with a nurse and told me I was next. At this point I was extremely upset and not in the best mood to go in for my long awaited (months) appointment.