I Need Tier 3 Support IMMEDIATELY

I have spent a week trying to activate my four mobile phones that I am transferring over from T-Mobile. I have been on the phone with Xfinity countless times for countless hours, as well as T-Mobile. I have been to the stores of both companies multiple times. I had a tier, 3 support person, helping me who has stopped calling me back. Every time I call, I have to tell my story over and over again, and be transferred over and over again. I am exhausted, I want my phones activated! T-Mobile says there’s no reason they should not port over!

I have currently been sitting on hold for over an hour waiting for a supervisor on one phone, and I’m on another phone starting this process all over again. How do I get in touch with tier 3 support?