I got banned

So one day I come home from school and I find myself PERMA banned Okay so here's a little backstory of my account, so this account was created in s5 and I created this account to be my smurf and now I play this account like it's my main. I never cursed in my games and if someone was flaming me I just mute them and say nothing. I'm that player that doesn't really chat much unless to alert my team like when my enemy's flash is down for example. I love league and I want to continue playing it until I get bored of it. So I ask the Riot support why I was banned and he said it was because I was sharing my account info with other people. So I know that's breaking the rules, but I only gave it to my brother and one friend I trust. The day before I was banned my account was completely fine and I did not get a warning. I am willing to still get my punishment for sharing accounts, but I just really hope my account doesn't get deleted or actually become perma banned( which I am perma banned atm) so if anyone has some suggestion please let me know. I really want to start playing league again.