A support case was created for you and you should be contacted shortly by a Customer Support Representative, if you haven't been already. You can view and update your case at the Activision Support website. After logging in, go to "My Support" then "My Cases".
Try using a different account to play online. Check if the other account is able to connect. If it was able to connect, your account may be banned. If not, you can try portforwarding or DMZ to improve connectivity.