Is Tshan Markets a scam, or is it legit?

After singing on the Huan Ge Live platform for a week, someone messaged me privately and we started chatting. After a week, we added each other on Line. This person, who claimed to be Mr. Chen from Hong Kong, said he was in the daily necessities business and also invested in international gold. Since I personally buy physical gold, I had some understanding that international gold prices were likely to rise. He then asked me to download an app on my iPhone, and he would call me daily if there were appropriate trading points. He would instruct me when to buy and then sell shortly after when a profit was made, essentially closing the position. One day, the company emailed me about a promotion where depositing $50,000 could earn a bonus of $8,800 USDT. At that time, I didn't know that if I didn't deposit the $50,000 as scheduled, my account would be frozen and the funds in it couldn't be used. This was only explained to me by customer service when I tried to withdraw my funds. I wasn’t aware of this no-withdrawal rule because it wasn’t clearly stated during the promotion. Then I discussed this issue with Mr. Chen. Once he showed me his trading profits which were several million in principal, to prevent my account from being frozen, Mr. Chen transferred funds twice through customer service into my coin address account—once $40,000 USDT and once $30,000 USDT. The customer service told me that once my reserved funds were sorted out, I could withdraw without mentioning any tax requirements. However, when I was ready to actually withdraw the funds, they told me I had to pay 20% corporate tax or else I wouldn’t be able to make any withdrawals and even restricted me to complete this tax payment within three days totaling $23,000 USDT because all my principal was still in the account. I am now retired and don't have the money to pay these taxes.