Is China-Derivatives Futures co,.LTD. safe?

In this March, I received a friend request, which I thought it might be stock friend. Then I was pulled into a preparation group, in which members showed profits screenshots. I was moved and observed for awhile. Later, I also got registered and followed the teacher’s instruction. The teacher asked me to bring the deposit to 500 thousand as a threshold, claiming that professional teachers could operate for me. There were gains and losses. When there was only 100 thousand left, I tried to apply for the withdrawal. But the funding channel was unavailable on ground of risk existence. The teacher kept fending off and noticed me that the deposit/withdrawal might be deferred. The withdrawal is unavailable for one week.