1) Wait outside their office to meet, irrespective of appointment or not.
2) After a wait, manager comes with a mood of screwing you up.
3) And finally you are screwed and the ego gets dissolve and prepares for another one.
I recently had this experience. There was a planned interview with the one of this H.R lady of some reputed company. Irrespective of this it was planned,it was a prior appointment,that lady didn't turn up on time. I had to meet her about internship program of mines. I was disappointed with her behavior of not meeting on time and showing bundle of attitudes and tantrums rather understanding the students need and being an employee of human management. I wonder how shes maintaining good employee and employer relationship.
I understand If I have gone with out taking an appointment. I would have not mind waiting long hours. But waiting after appointment brought anger in me and after meeting her and knowing her behavior it brought disrespect too.
After meeting also,she was not of great help!!