My account got banned because of another dude

Yesterday as I finished 3 competitives with some of my friends I headed to sleep as usual but as I was going to get in bed my phone got a notification from a email, as I started reading I saw that it mentioned that I was permanently banned but what I thought to myself is that it's been long since my last time played so I checked and seems like someone got into my account used some shit as hacks to win some games with premades and got me banned, I know it sounds sketchy but I just wanted to know if this bullshittery is usual on lol, my account was created on 2014 and I haven't lost much is there no hope of getting it back or should I try to see if they even believe me? Should I tell them to check the log in IPs and see from where the f**ktard was?
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