AT&T Refusing to Unlock My Phone

I have been on an AT&T Business plan for as long as I can remember.  I recently got married, and my wife wants me to switch to her carrier.  I contacted AT&T about porting my number to the new carrier, and the rep told me that he was going to move me off the business plan and into a personal plan, at which point I would be free to port my number.  Unfortunately, the new carrier could not transfer my phone number over because AT&T would not unlock my phone BECAUSE MY ACCOUNT WAS NOT OPEN FOR 60 DAYS!!!!!  This is the plan that they moved me into!  My phone is completely paid off, and I have been an AT&T member for years.  

After spending over an hour talking to various customer service reps, they eventually told me that I they would refer my matter to their investigative service and they would let me know within four days.  I just received word today that they denied my request.  

AT&T have no basis to decline this request, and its is clearly violating its policy with regard to unlocking their phones.  They continue to deny my unlock request even though I have been with them for years and my phone is paid off.  They problem with my account being open for fewer than 60 days is absurd, as it was AT&T's rep who told me to start a new account, knowing full well that I intended to transfer to a new carrier.  It seems like a lot of people are having this issue, and maybe some sort of formal complaint could be made to the FCC or FTC?