Xfinity you have to do so much better! THis

I have been an xfinity customer for over 17 years. I recently switched from a bundled home phone, cable, internet plan to a internet & mobile plan with them. During transfer of land line to mobile device xfinity released land line. Then when they realized their mistake, they claim they were able to pull my number back (something about porting my number).  I have now spent over 3 weeks waiting for line to be transferred to my xfinity mobile account plus over 10hours on the phone with Philippine customer service almost every other day for hours on end! They have kept me on hold for over 2 hours on many occasions, promised to call me back next day to ensure matter was resolved only to never hear from them again.  They also claim if you get disconnected during the call they will call you back...another lie! I have asked multiple times to speak with Supervisor only for them to say they are busy. They then tell me they have now figured out what the problem is, I need to call my land line carrier to have them release the number ( which is them (xfinity) for past 18 years!) so that it can be transferred. I tell the it is them who I had the service with, they then act surprised. Same story over and over...let me look into this for you. Only to tell me sir, you need to call AT&T to release your number.....I do not have service with AT&T so how can I tell them to release my number if I do not even have an account with them??????