Acc stealing

My account was stolen a while ago, just sent me a site and I opened it, but I did not know it was a trick ... I opened it because it told me that there was free skin and then nothing just left, I entered an account and nothing left. just kicked me out of the game and then I went to LOL's site and then I saw that my e-mail was changed to another. Please pleasee help me want my account again.
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