Not knowing were here is I'm guessing
your cable provider is AT&T or one of their partners. soon to be called ComCast
I too get a bill from AT&T "Broadband" for cable tv but I can't get internet service from them.

Apparently their description incules anything from basic cable to full cable, internet, and voice service.
A little deceptive, but actually fairly decent service in most places.
I'm also guessing you will have plenty of questions as you get hooked up.
So ask away.