Please advise

I would like to lay a complaint against vodacom. They have been ignoring my emails requesting a statement detailing all the arrears on my account as reflected in their letter of demand. They have failed to provide that instead they just closed my case with their legal department without explaining what that means. I find this to be suspicious as though they are hiding something because I believe I am entitled to that information. Please advise what should be done should they deny me that right but list me at the credit bureaus