In order to delete your old COC account (Gamecenter profile) it will be necessary to contact Supercell. You can send them an email requesting you to cancel your membership. Alternatively, you may create a new google play / gamecenter profile and start fresh.
How do I permanently delete my supercell ID?
If you want to cancel your account, make sure you open the app and go to settings; then go to help and support and contact us. I’d like to cancel my gaming account.
How can I remove my CoC account from Gmail?
Go to setting in the bottom left corner. Select my account. Select remove account. It will remove all of the data from the phone.
Can I change my supercell ID email?
To change your SuperCell ID email address, click the gear icon in the top-right corner of the Settings page. Click on the profile icon in the top-left corner of the page.
How can I change my Google account in COC?
In a Clash of Clans account you need to log out, and then log in with the new account using the same password.
How do I remove my supercell ID from all devices?
To access a game from another computer, you have to open www.supercell.com. Click on the Supercell ID and then select “Log out”.
Can I change my supercell ID?
Once you reach Town Hall level 5, you can change your username for free. Go to in-game Settings, then click “More Settings” and then “Change name”.