Service at school is disappointing

My children who attend Centenary Secondary currently in grade 8 came home with a school project where the child has to make a Pandora box. A week before the assignment I arranged the material that is required to make the box. One of my children used an old box that was lying in the house as her Pandora box (this box had been bought years back). After the box was made and it was time to hand it over the teacher did not accept the box that was made however she accepted the box that was bought. The teacher then gave a period of time to which the box needs to be to her standard. The box was then painted and she marked by child 12/50. I have been at the school from 7:15 to speak to the principal about this matter, I have 3 meetings to attend to and I still haven't been attended to by anyone at this school. The secretary has informed one of the teachers but no one is giving me feedback on what time the principal may arrive or give me a time for when I can come again. It is now 8:45 and I am still waiting. This is really frustrating. Service from this school is pathetic.