Unable to Recover My Closed League of Legends Account After Hack

My League of Legends account was hacked after my PC got infected with a virus. To protect my account, I had it closed. Now, I want to reopen it, but when I reached out to support, they asked for specific information that I don’t fully remember. They requested the original email tied to the account, but even my brother, who initially created the account, can’t recall it. I’ve provided as much information as I can, but I’m still unable to regain access to my account. Riot Games, I need your help to resolve this issue and recover my account. Please offer a solution so I can get back into the game.