I hope you had some luck with the website Dave suggested. When I cancelled the direct debit and changed my bank card, AOL could - and did - carry on taking money from my account because the payment was linked to my account and not my bank card. I can't remember all the details but I couldn't cancel the direct debit and the bank couldn't stop AOL either. I had to contact my bank every month to ask them to take back the money, which they did. I hope you'll sort things out without needing to do that.
AOL ignored my letters; telephone calls were a waste of time and they replied to my first couple of emails with what were obviously standard replies, unrelated to what I actually said to them. After that they ignored my emails as well. I only got a positive response when I threatened to report them to CISAS, and then I received a letter blaming their 'system driven issue' but they did sort things out.
This was a couple of years ago before Talk Talk were involved so things may have changed. If not, this site may help you
http://consumers.ofco...oms/service-problems/
Good luck.