Customer service

I attempted to lower my monthly bill...my first mistake!  Promises that it would be lowered by $30 if I roll over my landline to a mobile line.  Good deal but I wasn't told that now there would also be a mobile bill!  Phone arrived, activated it but the landline number didn't port to the mobile so now I'm being charged a monthly device fee.  Chatted, called, spent 6 hours with different agents and each had a different solution.  Anyway, received TWO more phones (I didn't plan on using the first one let alone 3 of them!)  Finally went to the local store and was made many promises.  Three trips later and another 6 hours, two phones were returned and credited to my account but I still have the monthly device charge even though the store was able to port the landline number to the mobile.  And manager promised she would take care of the other bill issues.  Phone calls, voice mails, emails and no response from the manager.  Why provide the business card if you won't respond????  Is there any higher management to talk with?  Next step is total cancellation, pay the penalty and never do business with Xfinity again!  Thanks for any advice you can give me.