Either got hack stolen or riot change my password and email.

It's a new alternate account and played it 3 weeks ago but now that i tried to log into my account i actually can't get in. Tried to reset password but i did not get any email from all of my emails from riot. And nobody knows my password or never said to anybody. I just wanna know if there is a way to get it back. Gold 2, Character name: llllilllllllll