There is another perspective to be had here.
Perhaps he listened to your story in order to determine if the appointment was missed due to "circumstances beyond your control." Perhaps, after listening to your story, he decided that the missed appointment was caused by a series of choices, not beyond your control, and therefore payment for the appointment is a consequence of your actions.
I believe my therapist would have probably done the same, and come to the same conclusion.
JMHO,
L