Unhappy about the service at Pretoria North medical center

I am very unhappy with the service I got from the center this morning. I've been taking my baby immunization there until they started to reschedule the appointments via a call, I called the hospital on the 9th June to check when was appointment reschedule to which date, they told me that they still dnt have nurses, this morning the 14th, I call again and they tell me that I have missed my appointment. How is that even possible ?