Account got break in

Yesterday i got my hacked by someone and he played nunu in which game he was super toxic which earned me a 14 day ban,and he used my blue essence,i would love to know if something could be done to revert some of the changes(getting my account unbanned and getting my blue essence back),i also got kayn removed from my owned champion pool,but im not sure if he did that,i hope i can get some reply from someone.
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