I find this interesting are all affiliates of BC.GAME have the same issue if they are not from Nigeria and you can withdraw your earnings using a Nigerian Bank only, quite unfair to affiliate like you if they only have this option, knowing this, will promoters will likely promote BC.game if the withdrawal option is limited to a Nigerian Bank, hope Brainboss can help you with this and do update us for the development of your case.
Well ... yes, it seems to be the case, in the past they did allow you to exchange NGN to Crypto so you didn't have to deal with it, but at the moment it's not possible on their site.
Just keeping you updated the withdrawal request has been submitted on their site - also it's not $174 - apparently the Nigerian government is manipulating the value of its currency, so it's worth only $94 - check this link for example:
https://www.binance.com/en/trade/USDT_NGN?theme=dark&type=spotIt shows $818.1 so 76600 NGN is $93.64 at the momemnt.
On Yahoo/XE it would show $440.
A trade link was also created here:
https://bitcointalk.org/index.php?topic=5200468.msg61262649#msg61262649