Rito please

I woke up today and like always immediately opened up league and started playing. after about 6 or 7 games when i got back to my home screen i got an error message saying something went wrong, to restart the client and if the problem persisted to contact the support team, nothing out of the ordinary. its happened before and its not a big deal, shockingly to me when i went to log back in my account had apparently been permanently banned. this made absolutely no sense to me as my account has never even been chat restricted before, let alone banned for any amount of time. the error message on the log in screen prompted me to check my email registered to the account for more details. so naturally i did, trying to figure out what exactly happened. even more to my amazement, when i got onto my email, no such email had ever been sent. i never received a single piece of mail illustrating how and why my account has been banned. i have had this account for just about 4 years now, i have spent unbeknownst amounts of money on skins, runes, etc. but more importantly (to me at least) are my 30 level 5 champions, and the fact that i own every champion in the game, without ever spending rp on something other than a skin. I consider myself a completionist so i have been damn proud of that feat for some time now. if i had received warnings, or even a lesser ban in the first place, my behavior would have undoubtedly changed in game. i love this game and i love everything i have achieved in it, i would never permanently jeopardize that (no matter how hard that teemo is feeding up top). anyone and everyone that can offer some insight would be greatly valued. i understand and take responsibility for my past actions, and i accept whatever consequences those actions have cost me. but permanently banning my account out of nowhere instead of giving me a 1 day, 3 day, or even week long suspension seems a little ludacris to me. please help.