I would be angry and feel dismissed ;-), but I would also ask for the time to be added on at an upcoming session or the difference in what I paid for the hour back. Frankly, the way I see it, he is "robbing" you and should have rescheduled whoever came second on his calendar. I definitely do NOT like how he said things about you retunring either - even if he felt defensive from your body language or something.

OTOH, I can be confrontational so maybe others have better advice...