DEMANDING BANK CHARGES AFTER WITHDRAWING.

I invested R500 in FOREX CRYPTO TRADERS as they said that they trade for you while you are sitting back watching.In a week i contacted this broker through whatsapp and they said my investment is matured,i can withdraw my money which was R150,000.After withdrawing they told me to pay R3000 bank charges into their capitec bank account In order to release my profits.They told me that i am left with 3 days to pay the bank charges if i do not do so i will lose my money so i didn't pay the bankcharge