Please help

Greetings everyone, My original account either got hacked or I forgot correct username/password. I was wondering is there any way to contact Riot Games so I can send them a message if they can check if the password/username got changed or not? Yes, I was stupid enough to not bother with e-mail (I don't know which e-mail the account is on). I have been playing League of Legends for a long time (I was away from couple months due to "in real life" work), if someone has some advice on how to bring it back that would be great. Thank you for your time and have a nice day everyone! Sincerely, Soul Sentinel (in-game name of that account on EUNE)
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