AT&T automatic renewal cost me $760 dollars

[jamal1984]

so i signed up with att dsl and phone line in july 2008 for 12 months, Cancelled their service about four months ago, switch to charter's.
Today i got a bill from ATT said that i got an early termination fees of $760 dollars.
Called in and att rep said that my contract automatic renewal and i can't do anything but pay.

Anyone else had this problems? any tips to help me out?

Thank You