Data usage:Why am I not allowed to know .....?

Can anyone tell me WHY I am NOT allowed to know how much U-Verse data I use? I have spoken to at least five AT&T reps. at length. Apparently data usage is a big secret. The "data usage since last bill" page is inop. They know it, they say it will be up, but they can't say when. REALLY?. The page has a message to the effect of "you don't need to know your data usage for billing purposes, we'll let you know if you're close to or over your limit". That's unacceptable. I pay for 250 gig. Why can't I know how much I use? They must know in order to notify me or bill me for overages.  I'm allowed to see how much data I use on my AT&T wireless, AT&T home phone minutes, natural gas, electricity, water, gasoline, etc. I pay for. Why not U-Verse data usage? Maybe I'm buying too much? How can I know whether they are billig me correctly if they say I go over? The practice smells suspicious. Not one rep was able to answer. They behave as though I'm the only person who wishes to know what I am buying, and the first they have heard the question.

Thanks for reading this far.

Josh