How to Contact Google to Cancel an Account That Has Been Compromised

1. Alert Google that you are locked out of the account by completing the form on the 'I Can't Access My Account' page. Type in an alternate email address and select the 'I Believe Someone Has Taken Over My Account' option. Disclose information about the products and services you use. Specify the approximate month and year you began using the account along with the date of your last successful login. Enter the last password you remember. Click 'Submit,' then wait to hear back from Google before attempting to cancel the account.
2. Secure the account if you are not locked out from within Gmail. Change your password and security questions from within 'Mail Settings' under the 'Accounts and Import' heading.

3. Sign into the Google Accounts page with your existing or recovered login information and click the 'Edit' link next to the 'My Products' heading. Select the 'Close Account And Delete All Services And Info Associated With It' option. Complete the short form and enter your Google account password. Click 'Delete Google Account' to send the request to Google.