If you read the Terms of Agreement, nothing you purchase in League of Legends is actually your property. Your Account is also not your property, it all belongs to Riot. It also states that Riot has the right to ban your account for any reason without warning. They also specify that by breaking their rules, the Summoner's Code, you can and will be punished. Your punishment depends on what you did wrong, you clearly are incredibly toxic so I am guessing it was Hate Speech, which is perma-bannable depending on the severity/quantity of it.
How to deal with being perma-banned:
- Stop playing League, go be toxic in a different game. (recommended)
- Make a new account and try not to be toxic again so you won't get perma-banned. (not recommended)
Although the easiest solution is to not be perma-banned in the first place, but that is a little late for you. By the way, it is 100% your fault, if you had an ounce of self-control you wouldn't have been banned. I suggest you take this as a life lesson and evaluate yourself a bit. Getting perma-banned from a Video Game may not seem like a big deal, but it is evidence of a serious character flaw that you should try to improve.