sorry, correct me if I am wrong(and sorry if I am repeating what you said), your complaint is that they included the money you deposited into their promo, right? I mean you were supposed to get 3.3mbtc (after you cleared the wagering requirement) then plus your deposited coins which 2mbtc, so you are supposed to have 5.3mbtc in total but because they included your deposited amount into their promo you only got 3.3mbtc? reading through it, it seems like a huge misunderstanding. I hope trustdice could properly explain as to why they included your deposited money into their promo.
It looks like his deposits and wins from the free spins were mixed so the casino could come up with a counter-argument that he probably wouldn't reach the 40x wagering requirement without using the 2mbtc.
It's quite a messed up system and there has to be a way to separate bets using promotions and those regular deposits. Maybe there's an option there to forfeit the bonus winnings so he could just play normally with the 2mbtc.