Don't they ask for TXID's? Screenshots can be manipulated, I'd suggest you go through your incoming transactions or even the sellers and ask them to provide the TXID, it's your best shot. Another thing is to keep a copy of all addresses you send money to, so you can manually get your TXIDs if necessary.
OP should probably do all of those things, but from what I've read in other threads and based on my own experience none of it is going to help. HitBTC are scammers, plain and simple--and if, for some reason, OP does get this issue resolved, I would encourage him to report back here and followup on this thread to let the community know it's possible to NOT get scammed by those jokers.Just as an aside, the list of exchanges on any altcoin's website should not look like this:
That's from Curecoin's website, by the way.