Fraudulent purchases on my account getting put on me

I'm currently on hold for 30 minutes trying to get back to the office of the president because I had to file with FCC, but I've lost what little hope I had that this might be resolved. Short version is someone I know, never met and not friends with, was "down and out" and and needed a phone line. I mistakenly decided to do a good deed and help him. I didn't know he was a convicted internet fraud criminal. He apparently went into a store and bought six phones and opened six lines, and disappeared, leaving me with a $1025 monthly bill. All he had was a phone number, and somehow he got into my account and changed his authorization status or something, I can't figure it out. Either way, I didn't buy these or OK the purchases. He went into a store, out of state, and the manager there did an override and even made a note that "customer was not there." The guys in the store here totally get it and are on my side, but anyone on the phone so far including FRAUD dept pretty much say it's my debt. I can assure you I'm not paying $1025 a month for years because someone else hacked me basically. I'm a disabled veteran on a fixed income, the only ring I did wrong was try to help someone who turned out to be a bad person. 

What are my options here? I can't believe that (Edited per community guidelines) is out defrauding more people as I type this and ATT is doing nothing and just charging me. Please help.