My withdrawal was refused and I was told that I could not withdraw the money unless I paid the tax.

In the LINE group of a teacher called Shigeto Matsuoshi, he was recommended to trade from BOKF's FX app, and was trading after receiving trading instructions from Koji Murata of BOK Financial's Japan branch. After that, I was advised to trade crude oil and was told that I could do so with a margin of $68, so I bought it. However, on the settlement day, I was told that I had to pay in cash and that I needed $6,800. However, when I said I didn't have the money, they said they would lend me a loan and took the money as a deposit. After that, when I tried to withdraw my profits, I was told that I could not withdraw the money unless I repaid the loan in cash, so I borrowed money from friends and managed to repay the $6,800 (960,000 yen). I was told that I could withdraw the money at any time if I repaid the money, so I applied for a withdrawal, but this time I was told that I could not withdraw the money unless I paid the tax in cash, and the withdrawal was refused. I would like my friends to refund me the money I borrowed. please help me!