That's not true. We have necessary short maintenances but we were not down for 3 days - check trading history on coins. As for maintenances - here we posted already: https://bitcointalksearch.org/topic/m.22578965
As for any possible issues with accounts/deposits/withdrawals etc - use our support system: https://c-cex.com/?id=support
At the moment we do not have unanswered tickets. If you think your issue was not resolved - just post answer into your ticket. Please, note - if we already resolved your issue and give proofs like blockchain links etc - but you are still posting that it is not resolved - you will most probably not get an answer as we consider it as ticket spam.