If you signed up via Google/Facebook setup a Deezer password at [https://www.deezer.com/password/reset](https://www.deezer.com/password/reset) and click the confirmation link you'll get via mail. If you have your Deezer password, open your account settings. Click 'Delete my Account' at the bottom of the page. Enter your Deezer password and confirm the deletion in the confirmation mail.
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