first confirm on ban appeal page that its not a temporary ban which would show permanent on steam/bnet and in the game
these types of bans have existed since spring mw2 but are more explained in this article
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i suggest you read up on this, another note is that bans can sometimes be delayed by months recently, for example if you bought the account or if its old and you used something that was detected in the previous months, you couldve gotten banned now as well