Colx is not the only coin affected by the CoinsMarkets exit scam, people report bitcoin, litecoin etc on this thread along with other coins: https://bitcointalk.org/index.php?topic=2185903.3660

Colx volunteers did the best they can do to shed some light on the situation whereas others were trying to cover things. It’s one's responsibility not to leave coins on an exchange exactly for situations like this. Please do not put the blame on someone else (on some level I believe you know you were wrong to keep the coins on the exchange).