Unable to withdraw

Since I started to trade spot gold, after the first investment of more than 20,000 dollars, the introducer has been asked me to continue to deposit, because when the top up reaches 100,000 dollars, I can get the trading cover fund of 4976 dollars. At that time, the platform did not specify that the amount of the transaction should be equal to the amount of the deposit before withdrawal. I asked if the platform could return the cover money to them and they said no. I had to trade. Well, Then, I had my introducer guide me through a trade to win a profit of $19,035. I think that the transaction meets the requirement so I can withdraw now, but the platform said that 20% personal income tax should be paid to a personal account. I confirmed with bank that the money of individual income tax needs two working days to arrive, but it tooks a week for the finance department to receive the transfer. Originally, it said that tax can complete in one working day. After a week, they told me that it found out that my previous sum of 50,000 U.S. dollars was to be charged by someone else, and I need to pay an additional 25,000 U.S. dollars as a pledge deposit, and it needs to stay in the platform system for a week. This fund was chargerd by the introducer who guide me to trade spot gold. It makes me wonder if they are in collusion. Because the introducer has been urging me to top up 100,000 U.S. dollars and said that I can make more money. Seeing that I have recharged 60,000 U.S. dollars and don’t plan to recharge, I recharged the platform with 50,000 U.S. dollars, but I can’t verify whether the introducer is actually recharging the platform or not. Internal collusion. I don’t plan to recharge anymore, so I am afraid that I will make other requirements after the rush. In short, I feel that the principal cannot be returned.