Banned for third party??? I didnt even do anything helppp

(not my picture btw idk how to insert snips as a link) Its been a year since I haven't played league, so I missed playing the game with my friends. So naturally, I redownloaded it and enter the correct information to login. But once I clicked login it said I was banned. This happened to me on another game for the same reason but I sent out a report and eventually got unbanned. Can someone tell me what's going on or does it mean my account got disabled for not playing for a long time? :'(