Direct TV Once we cancelled their service they said we had used paperview before and after we were customers , Internet

When we cancelled our Direct TV account, they told us we owed nothing.  The month after they told us we had been using paperview since 2005 until April 15 2013.  This is a rip off. 
-We never ever watch X rated movies
-We used Comcast until 2006 and cancelled the account in March.
-To use paperview we had to connect our landline to the TV but we rent from red box so we never connected the land line to the tv.
-The charges never appeared until now and they claim that this is before we charged on the landline which we never connected to the TV.
-We have no children in the house or house guests and have never used paperview.
-Their response was that unless we pay they wil go to a collection agency.
-If they do we will go to the Consumer protection agency of Montgomery County, MD and to the Better Business Bureau.  If necessary we wil go to the news.