Unable to withdraw. There are lots of money left in the account. Please help me

After I initiated the withdrawal, they immediately deducted the MT5 account and asked me to pay 20% tax. They also claimed that my deposit was about 60,000 more than the actual profit. I asked them to deduct and transfer the rest, and their answer was that they could not deduct. I later asked them to cancel it, and the answer was the same: they couldn't. This must be a scam