Unable to withdraw coins

I trade at LBANK exchange. When I want to withdrew coins for CNY, the customer service said that I need to pay a tax of more than 40000 US dollars. After making the payment, it said that thje bank account need to be reviewed and pay another 50000 US dollars handling fee, and then they will process the withdrawal. What the hell? I cannot withdraw the coin that I earned and have to pay tax and handling fee? It is such a fraud platform and need to be exposed. Defrauding customers of their hard-earned money under the guise of serving users...