You have probably violated the terms and conditions of the 1xbit site. I really can't imagine anything else. This site has had major problems in the past from players who have broken the rules and who have deliberately tried to abuse 1xbit's API. I think it's a really good idea if you post a screenshot of your 1xbit betting summary so we can assess what might be going on. And I'm sure the 1xbit representative will respond as well.
On what sports did you place your bets?
1xbit blocks players account if that player is in profit. When 1xbit blocks the user's account, then the user does not have access to the account, then how can the user take a screenshot of his account? You may try to defend 1xbit by making excuses like this but you won't improve 1xbit's reputation.
Because the way they are scamming their customers, customers have no way to reactivate their account. This is the reality and this is how the 1xbit team continues to operate.