The foreign exchange software J.P. Morgan gave no access to withdrawal

I added a friend via QQ. He told me he invested in a foreign exchange software called J.P. Morgan recently after talking for a few days. Then he asked me to invest with him and promised if I followed him, I can ear money. I’m in doubt about him at first. However, I earned money after several investment with him. So I invested all my money. I withdrew after a few days, but the customer service told me that I have to pay tax to withdraw. I withdrew again after paying tax. The customer service said I should pay margin of 40,000. This platform is still operative. The guy who introduced me is out of contact. I called the police, but the police can’t find out any information about the guy according to the clue I offered. The police told me that guy doesn’t exist. I don’t know what should I do.