I cancelled my cable TV with Comcast on 4/24/08. They are still charging me for it, and when I contacted them to find out why, they said this is standard procedure. I'll be paying until June for cable TV that was turned off almost 2 weeks ago! That's if they aren't lying, again...
Why did I cancel it? I was told by customer service when I wanted to cancel the first time that they would extend the package pricing of TV and internet, then was later told after I got my bill at full price for each service that the representative had lied to me. They didn't even attempt to deny it!
Don't get an account with them unless you like throwing your money away and being constantly lied to!