Bad trading

I started btc trading with Tradedesk fx in March 2020. Everything went well until my trading was done. The profit was R250 000 I asked to withdraw, the money and in the end I paid R36 000 to withdraw but I have not received anything. Now they say I can receive 2million but they need R78 000. I have told them I will not pay that then I get threatened that they will cancel my trade.