Windstream Communications Insists I pay for services I did not receive after I terminated with them, Internet

I called Windstream Communications on 10/2/12 to cancel all of my bundled services (telephone, internet, satellite tv through Dish Network) with them effective 10/6/12.   They informed me that I would need to contact Dish Network directly to cancel that service, even though it was part of my Windstream bundle.  I did call Dish Network immediately after talking with Windstream and cancelled my service with them effective 10/6/12. 

I have now been billed $137.63 by Windstream for all of my services between 10/4/12 and 11/3/12. 

I have spoken by phone with three different Windstream representatives and explained to them that I did not receive their services after 10/6/12 and would like to have my bill prorated to reflect only the charges due for the two days of the billing cycle for which I did actually receive their services.  The first two reps simply refused to even discuss the possibility of proration and the third ("Kristin" in their financial department) finally told me that "Windstream does not prorate."  So, even though I only received their services for 2 days of the billing cycle, I am required to pay for the additional 28 days during which I did NOT receive their services.  Ridiculous!  Isn't this illegal?