How do you react when people do not respond to your important appropriate questions?

I am not going to mention the name of the program. They are a decent adult program. The teacher is giving me almost No Feedback. He requested Cd’s of my son working with a Ta from his former school. At home and I sent them. I still receive no Feedback.
I work with my son and he does well for me.
What should I do? I do not wish to be confrontational but I feel the teacher is being disrespectful and is rude.
I always worked with my son’s school. I am trained and experienced. I want to be helpful and to know what my son is doing.
Why don’t they understand? What should I do next?