You'll need to have at least one of the credentials associated with your account to recover it post which you can go ahead with deleting it.
Just to confirm, have you tried signing in following the steps outlined here: https://goo.gl/MZ4Ss3 ? Keep us posted!
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This Tweet is unavailable.
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Here's an additional guide that may help you regain access (it covers more scenarios): https://goo.gl/q2Ijwz . Hope it helps.
End of conversation
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