perma banned but i have no idea how

Ok so I just logged into my account and the first thing I see is that some one else is logged in on my account, then I try to play a game and it says my account has been permanently suspended and right now I'm rlly scared :( cuz I don't know what happened and suddenly I have a perma banned can some one pls help cause I think some one has been playing on my account :( 2 weeks ago I already got a ban and I don't know how pls help I'm freaking out
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