I haven't use hitbtc due to various scam accusations even before and complains that I've read.
Not only one person is complaining about them but there's a bunch of it so those testimonies were enough to stay away from them.
Edit: I just saw this
Dear traders, due to some problems in our hosting providers infrastructure, all the HitBTC services are unavailable or partly available starting from 11:30 UTC 24 May. We will post an update as soon as the issue is resolved.
They have an update regarding this on their twitter account and it says they resolved it so everyone open a support ticket to them.
https://twitter.com/hitbtc/status/999654699526737920