A friend of mine got his account stolen

Recently a friend of mine got his account stolen. I noticed him being online after being inactive for months, so I messaged him (on discord, cause ''he'' didnt answer on league) and he said it's not him. Turns out he had lost access to the account. The password was changed and someone else is playing on the acc. He doesn't remember the email also. He knows all the other info about where he made acc, first champs, skins etc. Already sent a support ticket, but no response yet. Is there any way to recover the account without having access to email anymore?
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