My Account got hacked and i Got Perma'd

I recently tried to log on my League Of Legends Account of 7 years this morning after taking a break for a day and when i logged in it said i had been permanently banned, when i logged and it said i had been banned for using a third party program, when i looked into my match history to see if i could try to determine as to why i was banned i had 2 games in my match history that were not from me they were poro king games 2 of them, from what i would assume to be early this morning. i really would like someone to help me out here i've spent 7 years with the same account had lots of locked skins and i would never use a third party program after playing the game for thousands of hours with over 300+ skins on the account plus i have no interest in doing so. If anyone has any advice or anything they can offer id really like some help ill put a link of the ban email that was sent and my match history. Might i add i have never had a ban on this account or a suspension. Thanks everyone hope to get it unbanned cause ive never used a third party program and put in a support ticket this morning so hopefully will hear back soon. My support ticket id for anyone that can help is #44247106 P.S. Best i can assume is someone hacked into my account and played some games on it then i got banned immediately after. I changed my password on the account to try to keep whoever it was out of it. Not sure if that will help but i hope it will. Also Here's a link to my match history the last game i played was the nocturne aram Game https://matchhistory.na.leagueoflegends.com/en/#match-history/NA/33447230