Worst experience ever

I am standing in front of the centre and being told that they only assist appointments. Nowhere on the natis site does it tell you that you need to have a booking to be assisted.I took leave for the day which to sort this out yet not been helped.no one is even trying to find away to assist.Really dissapointed as this was a waste of my time. So they do not even care if you had issues with the system or not just sorry I can't help you even the security at the gate is so adamant about this its just unbelievable....