Permaban (someone has gained access to my account or has infiltrated in my account)

Hello Riot Games. So I just received a message of permaban on my account today when i logged in. And i dont even understand why since i didnt gave my pass to anyone and i did not do that. I didnt do any of those flaming. The phrases ive seen are insane but it wasnt me that wrote them therefore i might be afraid that ive got hacked or somehow someone has gain access to my account and i dont know how, i really dont. Maybe you can try to send me or link me another password i dont know, but im really sad and frustrated about this. Because overall its not really fair that i got banned for something i havent done right? So please im here to ask you for help, i had a lot of stuff on my account and i dont wanna loose it bcos of Account hacking or whatever its called i dont really know what happened please help me getting my account back, please! Thank you i hope you really understand my situation here...