Grin/BTC and Grin/USDT is not affected in Bitforex!! In their announcement is clear that only Grin deposit and withdraw is unavailable due to slatepack upgrade. I used Bitforex twice this week without any problems (sell and buy Grin). Also 17 days ago we had the issue with Grin-network. But if you do not want to wait you can contact them and take your answers 
I have a question. Are there still people who leave their cryptocurrencies on online platforms and exchanges?