Coinbase Network R55 000 fees and R35 800 OTP charges

I have money in my wallet, firsly my money was transfrred from the IG group by a broker. I di not choose it Coinbase as plartform. The money was initially R125,000 afterpaying the OPT fees amounting to R35,000 as requested the amount was included in the wallet. Now they want me to pay a newtwork for R55 000, i dont hane the money and i cant trust that they will paymen. The assured me that after paying R35 000 that i will be able to withddraw. Everytime i try to claim thers more costs to pay