I believe CSA is withholding information

Child now passed 18 years of age & CSA say child still in education. I have asked for information with regard to courses taken or approved continued education criteria.

My numerous letters have not been answered & they say I need to keep paying. How do I get the CSA to supply information that I ask for?

I believe that CSA are withholding information that I should be entitled to have access to or are they victimising me because they can & keep me paying for the sake of it.