account really belongs to you, then you probabily have the phone number so delete old account and create a new one using that number. If the guy set 2FA then you have to wait for 7 days for account deletion request.
another option is recover(?)@telegram.org mail and describe your issue.
If still not able to get, then sorry this topic is beyond the scope of this group.
Yes phone number is available Can you explain more clearly how to do it with a phone number?
If you have the number yes And please ask here about telegram problems @TelegramAndroidTalk
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