General Revenue Corporation GRC Refuse to send anything by mail Cincinnati, Ohio

GRC, had contacted me in January, to set up a payment plan for ISU. This was fine but the company refuses to send me any kind of statement in the mail, claims it's against company policy. Well that sounds kinda fishy to me. I was always told that any kind of debt collection agency  has to provide statements if asked. Why can't they send statements? This lady I have spoke to several times says everything is done over the phone?! What? If they can't send me statements I can't send them payments!