Cancel or move my lines to personal account

I enrolled in Citigroup's business plan but now I don't work there anymore. But my phone is locked and I can't get my number to my personal account. I called AT&T customer services so many times but they gave me different stories and also ask me to contact the authorized person. I don't work there anymore so I won't be able to contact this person. 

What can I do in this situation? Very frustrated!