Unable to withdraw

In October this year, I was brought into this platform by a female assistant through the Line group. I invested 400,000 Taiwan dollars. At the beginning, I received 600 US dollars and remitted it to my account. After a month of copying, I want to get my principal back. It took 10 days for me to reply that I should remit the profit share before I can withdraw the money. Now the female assistant has disappeared and no one can be found. The trader and the customer service of the stock company said that I need to pay the channel fee before I can withdraw the money. I checked the Internet today and I have paid the channel fee, but I can't withdraw the money. How dare I remit it?