I got falsely perma banned?

So I logged in today to finish up my placements. And I log in to see that it says I've been perma banned for the use of 3rd party software. Yet I don't use any besides Blitz, is Blitz a bannable 3rd party software? I'm really scared because I've spent money on this game and I don't know what I did wrong. I don't know if my account got somehow hacked. I would really like a solution to find out what "third party software" got me banned from League. Keep in mind this is my first time logging in for like 3 days. https://imgur.com/a/sS0jOAE
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