I deposited $200 now I lost all the mpney

At the beginning I deposited nearly 200USD, and then I started to make a profit here. It made me happy that it seemed easy to make money. I quickly got 700USD. However, the money is only a figure that this company shows us, and we cannot Withdraw. I was told that 700USD withdraw requires 210USD tax. However, the money has not arrived in my account now.