So you are taking the 200% bonus which is part of the 2 million blackjack hand promotion?
I checked the promotion page but cant find about this promotion, then I checked my email and I found the email about this 200% deposit bonus.
So I assume that you knew about this 200% deposit bonus from the email you received few days back.
As I can read on the email, it is being stated that the max bet while taking the 200% bonus is 0.005btc as we can see below:

So it is true that you did a mistake by betting more than what is allowed.
Seems that you did not read the email completely, that's why you did the mistake that makes you lose what you won.
On the other side, the terms says that any bets that exceed the max allowed bet will void any winnings.
As per my understanding, you should lose your winning amount only (not your winning + your initial deposit).
Lets wait for Victor and hope there will be a better solution for your case.
The best thing tou can do is by accept the fact that there is human error in yourself taxationistheft to not understand the whole rules ,
unfortunately nothing he can do for you. That's the irony of having a lot of terms and conditions.. even it's pretty clear stated there, some people will still failed to understand it leading to a losses and disadvantages and that's the place of casinos getting their profit, pretty ironic but that's the truth.