Promo related winnings always comes with lots of confusion,they don't even let us feel about our lucky wins and make them to regret with thoughts. Its probably mentioned in their terms but its highly unethical if they changed terms to avoid paying the rewards after your win then I don't trust them, you also free to hear about others opinion regarding this.
Promo related winnings always come with lots of confusion I can attest, there have been countless times I witness such allegations and confusions and most times there are not clear ways to determine the truth except the gambling site involved would come up with their side of the story. The amount involved here isn't much, so I am hoping to read from TustDice and then know the total truth.
Who cares to investigate what Ognasty pointed out below
It seems like the time to have a dialogue is here for the OP, but no response on the allegations that they are using partial screen grabs to mask their intention of defrauding the casino.