OP has replied to your previous post and I think he or maybe his team is working to fix it now, indeed waiting is something annoying but that's all you can do now. Wait till OP post to confirm that issue is fixed then you can try to withdraw your money, keep trying when OP is not confirming that it is fixed already then high likely you'll get the same.
The current transactions fee of 3000 satoshi is hardcoded, if in any case the transaction fee is higher than 3k we're paying the missing amount from our bank.
In any case you own 13k and withdraw 10k you should end up with 0.
Hardcoded means that 3000 satoshis is a fixed transaction fees, no matter what amount of withdrawals. If in cases, users require withdrawals that have more than 3000 satoshis in fees on network, the site will pay for the rest fees as kind of supports for users on the platform. Do I understand your clarification correctly?
I think I have explained to you clearly but yes it seems that you understand it better now. Actually it is simple thing as most bitcoin related sites has the same fixed withdrawal fee system. It makes me wonder, how many times you have made withdrawal from bitcoin related sites?