Your work should be convincing to take out the bad feedback in your account.
Maybe he will be lucky and in the next DT1 changes my feedback will disappear, as I see that I am the only one who has tagged him. But today I will not change it because it is still true that I would not deposit a penny on the site, as what happened indicates either scam or that they are bunglers who are running a site without problems to accept deposits but that does not work as it should work, especially to process withdrawals. In both cases anyone who deposits money there has high risk of losing it even if they get positive results in their bets.
Another thing is how they have dealt with the complaints, which in the site's thread were mostly ignored while responding to the welcoming ones.