PLEASE,READ-A HACKER CHANGED MY EMAIL - PLAYS ON MY ACCOUNT - GOT ME LEAVE BUSTER.

Hello,summoner(I'm hoping you can help me,and if you do,please,reply.)I once log-ined into my account,and realized,there was a game played on my match history,that i don't remember playing.(That happened about 2 months ago)I tried Changing Email,but,i noticed,that it was changed-I still can play on my account,but he can log-in anytime he wants.So,i decided to send a ticket.I know,a bit late,but...-The hacker got me a leavebuster-Today i checked.-The first game he played was - ranked game/0/18) Rammus,and reverting all my runes and masteries.It's shocking,cause,i tried to transfer-The hacker found out tho...Cause,i spend so much money on it...i really wanna someone to help me out.(hopefully Riot member.)I believe,i still have the picture,when he first fed with Rammus.And overall,he's getting bad scores on my account.Help,please.-the links i will send-My old username.-Since i transfered-I also changed my username.I'm still pretty stressed out cause of that.I also don't remember most of the information about my account-So,Riot most likely wouldn't do anything about it.I think that's pretty messed up.I have about 170 skins on it...