Received an Email about being Banned for Recent Activity but haven't played in two years

So my call back to this game after leaving it alone for two years is receiving a email about the account being banned for using third-party program.

The first thing that came to my mind was back in 2014 when we had to use an side program to record game data for replays, so I thought oh maybe it was that but then I checked my match history and saw that someone was playing on my account last month and imminently knew my account got compromised.

While I was very upset I received no warning that my account was compromised I went to support to appeal the ban only to be told it wasn't compromised and that was crap out of luck on getting it appealed.

Riot please get a better login system that requires some kind of outside system (i.e email code, phone text, F2A) when people are connecting to an account from a new IP address, so others don't have to go through this hassle I am in

Sorry if this is posted in the wrong section of this forum but a google search seems to show this is where all the talks about bans go

Update - After following Jo0o advice to try the account recovery team ticket I now have my account unbanned hopefully I don't have to go through all these hoops again if I decide to take an long break from the game.

Big Thanks to who ever was behind the name "Alkrion Ironbeard" for handling my ticket