Phone activation

I have been trying to activate my new phone with Xfinity since December 8th. I want to port in my number from T-Mobile. I’ve gone through three port out pins because they expire in 7 days. I think there have been 9-10 attempts to activate. They fail, they are cancelled, and we try again. The definition of insanity is “doing the same thing over and over again and expecting different results.” Two agents said they would call me back and never did. One even promised me and said “I never break my promises.” How can I reach someone that can do a deep dive to solve this issue? I’ve spent hours over the last three weeks on the phone and chat, and I’ve exhausted my patience with this process.