Lucky you got your funds back! I was also skeptical about HitBTC until I had a similar issue. During the 'crypto-kitties' hype the Ethereum & erc-20 wallets were acting funny. After sending some ETH it literally disappeared in front of my eyes while transferring from the 'main account' to the 'trading account'. I spent a few days back and forth with support and they eventually credited my account. They were pretty helpful and responsive.