Account stolen?

I logged into my PBE account today after a good while of not using it and I found that my summoner name was changed, I also had a game in my match history I did not play. Then when I logged into the site so I could change my pass it looked like my email was changed to a completely different one. Now when I try to change it back to mine it wont let me because I have to answer a email that was sent to a random person with access to my account. Never shared info before so I am super confused
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