Is MASTER MIND CAPITALS safe?

After I deposited funds into this platform and made some profit, they not only wouldn't give it to me but also blocked my account. Later, after I reported to the police and filed a complaint, they unlocked my account, saying they would refund my principal. They threatened me to withdraw all these reports and demanded that I lose all the money in my account before they would return the remaining principal. I think they are definitely playing a long game, fishing for bigger fish. Because my deposit wasn't large, they are afraid that my continuous complaints will cause a big stir and interfere with their plans to catch bigger fish. So, does that mean all the money I earned through so many days and nights of work is just going down the drain?

I opened my account through their partner and deposited $6,200. At first, I could withdraw funds a few times, but later they wouldn't allow me to withdraw anymore, saying that my frequent withdrawals were suspected of money laundering. As a normal investor, would money laundering involve such a small amount? Now they've sent me another email asking me to pay a 50% margin deposit. In the morning, they froze my account, and in the afternoon, they unfroze it.