The worst customer service ever.....can't say it any nicer

I recently changed my Xfinity service from a land line to a mobile device.  Xfinity mailed me a new Samsung phone.  When I went to activate the phone and transfer my number from the land line to mobile device, it failed. When I first called Xfinity for help, I was informed that my land line was no longer active and they had no record of it existing !!    I was on the phone for over an hour and transferred 3 times with no success.   I eventually had to hang up.   I called again tonight and have now been on the phone for close to 3 hours, have been transferred 6 times and still nothing.    Every time I have to give the new agent the same information that they can clearly read in the notes.     I have had both mobile and land line on a 3-way call together and they still can't figure it out.   To call this frustrating is a gross understatement.     I have absolutely ZERO faith in Xfinity.    This couldn't be a simply process that has been butchered beyond belief.  Why I can't get a single agent on the phone who can handle this problem themselves is beyond me.   [Edited: "Inflammatory"].  Its a shame my payments can't go to providing actual customer service when needed.