You'll need to have at least any one of the credentials associated with your account to recover it. After which you can go ahead with changes. Also, have you tried signing in following the steps outlined here to access your account: https://goo.gl/v7CdWx ? Let us know.
Here's an additional guide that may help you regain access (it covers more scenarios): https://goo.gl/q2Ijwz . Hope it helps!
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Unfortunately, account recovery deals with sensitive or confidential information, we don't have a live support for it.
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