I give it a star because it cannot be zeroed. Regr...

I give it a star because it cannot be zeroed. Regrettable organization. They sell you programs that do not comply. His interest is economic and not to teach students. They do not meet calendars, they cancel classes or there are no classes and then they do not make up. It is all chaos and a waste of money and time for the students.
You know perfectly well which are the programs in which you fail, if not you do not have internal control of the quality of the service.
You only make you act with public criticism like this.
Yes, of course professionals can have schedule changes, but after talking to them in class, you tell us that you had not notified them and that you were the ones who canceled sessions. So don't blame the professionals.
You take advantage of that "excuse" to do what you want with the schedules and abuse the students, because you prefer to save on budget.
On the other hand, it seems incredible to me that teachers have to put good reviews to raise scores ...
You just have to be honest and fulfill the commitment of what you sell.