Someone else hacked on my account

My account was banned from league of legends for using a third party software. This came as a surprise to me because cheating was never something I did in the game, and I never wanted to either. I decided to check my op.gg and in my recent games played it shows some ranked games played on a character that I do not play at all (I don't play ranked, and mostly stick to blind 5v5). I can only conclude that someone gained access to my account (I do not share my account or password with other people) and hacked on it. I am hoping to be able to get a manual review of my account where it can be checked that the ip address of my account where the hacked games took place is not the same that I normally use. I understand if I can not get my account back, and I do not mind continuing on a new account because I don have any intentions/rush to play ranked and have little need for the progress on the account. But it is a shame to lose the money bit of money I spent on the game since im a teen and dont have reliable money, as well as my mastery levels, and the name that I like to use across all platforms. If it is possible for this post to be seen I would much appreciate to know if there is anything I can do.