Help! Unbanned me plz

I just started playing league and i have a friend who play league for about 3 years and i want him to coach me so i told him to do so. He spent a night over at my house a lot and i see him playing with my account for a bit and do stuff i didn't mind that, and he also coaching me. Sometime i took a nap and i dont know what is he doing to my computer or account but he mess my account up. took my password and now i got perma ban, and the reason is 3rd party used. And i did check my computer and it said that i have a virus so my friend hack my computer and took my account and now i got ban. Please riot i never cheat everything here is honest and i tell truth. I can even send you the pic that i got hacked
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