Account Scammed/Compromised, Hacked

I am writing to report an issue regarding my Riot account. Recently, while watching a content creator named TENZLvie streaming on YouTube, I participated in a giveaway by scanning a QR code and logging into my account. The channel had 12k subscribers and significant viewer engagement, which led me to believe it was legitimate. but later i checked and it was not his real Account. Unfortunately, after logging into the website from my Riot Account, I received an email indicating that the email associated with my Riot account had been changed to an unknown email address. I immediately attempted to recover my account but was unsuccessful. I have already filed a ticket but have not received any assistance so far. The unauthorized user has since changed both the username and password of my account. I have attached screenshots as initial proof and can provide additional evidence such as my last purchase receipt, in-game details, and any other necessary information to verify my ownership of the account. I had File two Tickets In the Support Center but didn't Get back Any Response yet. I am worried and scared. Please Help me out with this. Please assist me in recovering my account as soon as possible. Thank you for your attention to this matter. I hope to hear back from you soon.