In summary:
1. Betkin changed their Terms without notifying players.
2. They lied about changing the Terms.
3. They misapplied the new rule retroactively to confiscate $5,000 of my funds, most of which was real money winnings.
4. They refuse to provide a clear justification or explanation.
It is indeed alarming if they have recently changed their bonus related terms and applied it to you. I can see that the representative of the casino is silent and haven't said anything about your issue. Only the campaign manager is trying to help you a little by forwarding it to the casino team.
This is completely shabby behaviour and a clear sign of scam when a casino confiscates the deposits beside the bonus funds in this way. You have enough evidences here to support your claim. Hopefully there will be a positive result of your complaint in the near future. I would like to mention @holydarkness here if he can do anything for you.
Right from when Op first posted on their thread, I knew OP could have some evidence. For Betkin not to respond or resolve this till now, are we sure they will? I am afraid it might not end well because it seems that the real reps of Betkin are not in this forum.