DACLAND Capital Limited refused to withdraw money

I have deposited money into my friend's account in DACLAND Capital Limited (www.daclandindexq.com) and traded on MT5. At first, we can withdraw the money without having any issue. However, after we have made more than USD35 million through that exchange, they refused to withdraw the money for us and asked us to deposit additional USD15 million as an income tax to be paid to Japan Tax Authority. We have consulted with Japanese law firm and understand that the income tax must be deducted from the total amount of USD35 million. We have asked for support from Tokyo Stock Exchange and the police authority but no authority helped us. We have read many news and understand that this broker does the same with other customers and froze their account in order not to withdraw the money for the client. We need help on how to solve it as it is a huge amount and this broker is swallowing our money.