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.
I asked them to tell me what I did wrong. They replied as you can check by emails that they will not disclose anything of their "findings". They did the "investigation" and the money was forfeited in less that 5 minutes after I submitted my withdrawal request. So you do the maths....