Based on the attached screenshot, m88.com casino has determined that you violated their Terms of Use. Specifically, they have voided your bets in accordance with Section 8.3 of their Terms of Service.

That's unfortunate. But without more evidence, it's hard to say who's right. Did you genuinely violate their terms, or is this a questionable move by the casino. Unfortunately, m88 isn't represented on our forum, so getting their side of the story or forcing their hand is pretty much out of the question.