Charged for services not used

I have called and chatted NUMEROUS times to get this taken care of and I’ve got nothing but the run around!  No one l’ve called will help me with this and I’m at my wits end.  I was considering returning to Xfinity for TV/cable but decided to stick with who I was currently using.  I received the equipment from Xfinity but NEVER connected it, NEVER activated services, and actually NEVER even opened the box and took out the equipment.  I returned it to my local store still boxed and unopened.  There is a charge on my “account” for one month service.  How can this be if I never even hooked up or activated the service?!  I’ve had arguments with reps that insist that I activated the service, been told numerous times and given ticket numbers that the charge would be removed in “5-7” days, I’ve had them literally pass me on to no one.  I’ve been hung up on.  I actually had one very nice woman tell me she sees that I didn’t activate service and will take care of removing the charge right away.  It’s still there.  This has been going on for over 3 months.  Who do I need to talk to to get this taken care of?!  Worst customer service I have ever experienced!