How to remove your Activision account
Sadly, Activision does not allow you to completely Remove your Activision account
We suggest you Obfuscate/Randomize your account which basically means logging into your account and simply changing all of your real info to random/fake info since they do not allow you to remove.
Currently, there is no way to delete your Call of Duty account. If you wish to start fresh you may remove all of your personal information and create a new account with a different email address. ” http://support.activision.com/articles/en_US/FAQ/Deleting-CallofDutycom-Account/
Or you can contact them here http://www.activision.com/atvihub/contactus.do?site=en_US
Helpful Trick: Obfuscate your profile info.
Because most accounts and profiles at Activision cannot be removed, we suggest you login and change your account and profile information altogether.
Make sure you are logged in to your account on the site and click on the profile or options settings. Locate the fields with your personal info (email, name, address) and fill in generic, random information instead. If you can only select from several fields, change anything personally identifying. If possible, use a homepage/URL field or long text field (such as Description) and put this line in it: http://remove.org/removal-requested. This may encourage webmasters and admins to create an easier removal outlet.
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for Activision using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Activision. Click here to find out how.