Always good to see someone wanting to improve their behavior, that being said after briefly looking over the case review it's clear to me why you were banned.
You have a very large problem with swearing yes, but you also were rude, harassing, flaming, trolling, so on. If I had to guess I would say you broke most of the Summoner's Code in those 2 games. If you need a more in depth review pls feel free to ask, but the problems are throughout. Stop being negative against your team, against the other team, and try not to swear so much will help you a lot in the future.