Permanently banned for games that I played before the 2 week suspension!

UPDATE I sent a Support Ticket to Riot. If you have anything relevant to add feel free to do so

Hi, A long time ago I got banned for 2 weeks for toxicity. While this account was banned/suspended I was playing on a secondary account for 2 weeks. After the suspension was over I played 2-3 games on this account (past 2 weeks ban). After the third game I had an announcement that I got permanently banned. How is that possible? The new announcement had a chat log of a game where I was toxic, but the thing is, that game was played before the 2 week suspension. It was not a game from those 3 games that I did after the 2 week suspension. So i got permanently banned for no reason, without aving any second chance to redeem myself. How is that possibly. I get banned from a game that I played before my 2 week suspension!? Is this how the ban system works? I don't understand.

I only wrote this today because I didn't think about it at the moment. I though maybe I deserved the ban idk. But after talking to some friends a few days ago some of them told me to write a discussion here.