Port Nightmare

Has anyone experienced a nightmare porting in a number? 

I left Verizon in Feb, granted I wasn't unhappy with Verizon, I just fell for the stupid AT&T pitch.  So now I am trying to come back and it's been a nightmare.  I have had this number for over 20 years.  It left AT&T on Tuesday night.  Now I am starting to find that well, we use our phone numbers for everything, two-factor authentications, to get into my apartment gate.  

This has been a nightmare, and I have no idea if and or when it will ever be resolved.