Woah that's a hell of a lot of money to be putting in but good luck to you! If it's any consolation, if Bitconnect pays out like it says it will you'll soon recoup the lost BTC, and if it's a Ponzi you might well lose the BTC thats made it there and have a bigger loss to worry about! Brave move!

Now I'm not certain and no doubt a more learned person will see and confirm or otherwise, but I don't believe sending from the exchange to a service provider is the thing to do, you should send it to your personal BTC wallet first and then to the service provider, only keeping on the exchange wallet what you intend to trade or send to a wallet. I know this is the case with some ICOs that I have invested in so assume it's the same elsewhere.

Make sure you contact Coinbse too, they may have experience with this if it really is an issue sending from the exchange.