AT&T Uverse Improper billing practice Carol Stream, IL Nationwide

We cancelled AT&T Uverse service as of June 19th, 2015.  Several weeks later, we received a bill that included June, and July.  Essentially, AT&T had an extra ~ $121.00 in charges that didn't match our service.  These charges were for June 17 through July 16, even though we cancelled service effective June 19th.  

I contacted AT&T Uverse, via the web, a few days before our bill's "due date" of July 7th.  I spoke with AT&T Uverse rep named "Adrian K," who reassured me that I would not be auto-deducted because my account was cancelled.  Of course, we were charged the extra ~ $121.00.  

We called AT&T Uverse and they said since our authorization was on file for the auto-deduction, they were within their right to take the extra ~$121.00.  However, AT&T improperly has our money for services they never provided from June 19th through (future dated) July 16th.  We just want our money back ASAP.