Unable to withdraw

I downloaded the SBI VC Trade app through a link sent to me. I bought and sold cryptocurrencies and after earning 244,247.5606 USDT I tried to withdraw but customer service said I had to pay 6% tax amounting to 14,654.844 USDT in order to withdraw. I did that after 2 weeks. After getting my tax receipt, they said I can withdraw but when I tried to my pin wasn‘t working. They said they‘ll look into it then they told me someone was trying to hack my account so I need to send 3000 USDT.