Don't forget your Therapist is human too. I think we forget that our health care providers have lives outside of their practices that may ocassionally conflict. Like us they have both good and bad days. They or their family members get sick. They face calamities and emergencies too. Perhaps it's not always possible for them to contact their offices and/or patients or whatever has come up is a necessary priority.

Yes, you should have been contacted but realize that isn't always possible.

Also, it's quite the norm for appointments to run late. Perhaps they had to spend extra time with an earlier patient. Perhaps they had to take in an unscheduled client on an emergency. Perhaps rounds at the hospital took longer than anticipated.