I wonder if you already got a response from coinexchange, if not yet, just wait a little bit longer. I saw their article about
Cross-chain deposit, there's a possibility that you could get back your BTC, however, you will pay a certain fee and it might took several days. See
Cross-chain Recovery PolicyThere are instant exchanges available out there (
like shapeshift, changelly, changenow and more) where you could exchange BTC directly to other coins you want. Coinexchange is not one of them, so be careful next time before sending your coins to exchanges.