Does this mean you're have successfully withdraw multiple times, but your $2,740 withdrawals since June 27 are still processing until now? the rest $13K which on your account has been wiped by them? they must be have explanation behind that.
Well, no doubt Duelbits flagged your accounts since you're won big money and exceed your deposit amount, I think they're currently do a whole investigation to see if your account have did suspicious or breaking their TOS.
AFAICS the accusation is legit and we're need to wait Duelbits's response this accusation.
Edit:
You should add your conversation with them.
And yes as you said but this 16 days bro this not easy and what kind of case take 16 days ? Put yourself in this situation are you can wait 16 days and you know you nothing do just play and everyone in chat now my play i win so much in live games i was get even 3100X on crazy coin flip