Individual — Non maintenance of appointment schedule of Doctors

I booked schedule one appointment for Dr. Sunandan Sikdar, cardiologist at NH Barasat on 24.08.22 at 4.50 PM accordingly I rescheduled my work. But suddenly on evening of 23.08.22 the hospital authority told me over phone to come at 11.00 AM . Though I reached well before time, the doctor did not come even after 2 hrs
5 minutes. (Time of reporting)
Now what do you say?
Do you want the patient party to wait and reschedule their own job time and again?
Is it proper administration of hospital authority?
Do you have such agreement with doctors to allow him to come at his wish?

Why patients are harassed repeatedly?

The same things happened in earlier occasions also.
I interacted with other patients, they are having same experience in earlier visits for different other doctors also.

Pls. do something so that the patients are not harassed further.