my account got banned without any announcement before

Hi @sikaret09,

The instructions in the link above walk you through the process of creating an appeal to have our Terms of Service team look into the situation further.

Resetting your password is a good first step if you suspect someone else may have had access to the account, but you'll need to follow the full steps listed above if you'd like to appeal this action.

The ban history does not display all types of account actions, so please be sure to keep following the steps under the How do I appeal my lock, ban, or suspension? section in the link above to actually create an appeal.