Hello @trayan!
You may have been blocked for using your account (or multiple accounts) created just to earn rewards. We want to reward only active members of the HIVE community so such accounts are regularly blocked. Every fake/inactive account lowers the prizes earned by real players, so we've recently started paying closer attention to who is participating in our games.
Of course, if you think we made a mistake in your case you can appeal. We evaluate the activity of an account based on 4 different factors, but it sometimes happens that we were simply wrong. Please DM us on Twitter, we will look into your case again and if everything is alright you will be able to continue participating in our contests again.
Best Wishes!