I used to gamble there regularly, but in order to limit my gambling habit I have stopped playing at DD. From my personal experience, some mod were friendly to me and knows me well. Their behaviour wasn't shady. Though haven't talked much with admin, so can't say how their behaviour is. And I have seen that you were having good communication with moderators at chat. Don't know what happened with you recently. Can you post few screenshot of that?
Yes, VIP is just a tag at the site, no extra benefits for it. Where you found that they gives extra bonuses to VIP members? As far as I know, lossback is applicable if a user have negative profit in previous month. Otherwise they offer higher faucets and it depends on user level.
Do you have any valid proof that their bet is unfair? After losing unexpectedly most of the gambler things that the game is manipulated. So are you saying these being frustrated or you have valid proof as well? And what about your profit stats in other coins? Your claim will be more reliable if you can show us the proof of unfair bets. By the way, I have few screenshot of your big wins. Why you haven't complained about unfair bets earlier while you were winning like this