Fraud platform without any bottom line

On April 18th, I deposited and traded of the index and I was lucky enough to earn 2,000 US dollars. When I submitted the withdrawal, I refused to withdraw on the grounds of monitoring the back-end and threatened me to send an email to admit that I violated the rules before giving the principal and also paying Part of the principal has been deducted. If it is said that the background monitoring is used, why is it not monitored for a month, but it is monitored when the money is withdrawn? What is this monitoring to monitor the profit and loss of customers? And it is a b position, so I choose to bet Don't be fooled. The staff in the background are unprofessional and can't give a professional explanation at all, especially the woman surnamed Wang originally had a Skype group chat as a connection to the group and removed me from group chat after the incident.