I had bought the original iphone 2G by paying the full amount when Apple launched the iphone in 2007. I started using it with AT&T by paying full no discount commitment fee in 2008. in 2010 i bought the new iphone-4 at the discounted price of $200. However when i had to leave the country immediately after purchasing the iphone 4, i had a dispute on the billed amount because at&t continued billing me even after i cancelled my service with the company. Now due to this dispute, AT&T is refusing to unlock my old iphone, although i have paid the full amount to at&t on that iphone. Is there someone within at&T's legal team who i can speak to about this.

Thank you,

Akshay