Unacceptable service

Had an appointment at Medicross Benoni Dentist department. Appointment was scheduled for 09h30. I called the same morning and asked if I could move my appointment later, as I needed a babysitter. The lady at the front desk said unfortunately not, and that I had to be there at 09h00 to complete paperwork. With a struggle to find a sitter, I arrived at 09h05 at the dentist. Standing in the line for 10min, as the lady was on the phone. Just to be told, they have an emergency, and that they were informed I need to sit and wait for 30min, only from my appointment time which is 09h30, after the 30min they will then make a decision if they could help me or not. No call, no message, to say sorry this is what happened, come later or don't come at all. I understand an emergency completely, but mentioning to the lady at the front desk that I called, and why they did not inform me, she just said I am aware you called, but I cannot do anything about it. No compassion, no apologies, just a you should have been called but you weren't. This after sitting with a broken tooth for over a week to get the appointment. Poor service, poor customer service.