Hmm, here's an additional guide that may help you regain access (it covers more scenarios): https://goo.gl/q2Ijwz . Hope it helps!
Thanks for reaching out. You'd need to have access to the channel to be able to delete it. Also, to regain access, you'll need to have at least one of the account related info (i.e email/username & any recovery options). More info here: https://goo.gl/bqDUzi . Keep us posted.
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