Account Banned

My game level is between gold and platinum. If I am practicing, why is my current ranking level still gold 2 (flex with my friend for 5) and gold 4 (solo/duo by my self)? If I am practicing, my account has been playing for a total of four years, and my ranking history can be viewed. I want to sprint to the Platinum stage in the S8 season, so I play qualifying every day for the month. I like the IG team. When the IG team won, it motivated me to keep playing. However, now that you have banned my account, I am very upset and feel unfair. If a game in the United States is unfair, I don't know what else is fair. On the other hand, when you ban my number, please give me the reason and reason, I don't know why. As an old player, I have a unique love for the League of Legends, but it is cruel and unfair for the company to treat a player who loves LOL.