It seems like the issue here lies in the fact that you knew gambling was illegal in your country, yet you still participated. Also, the amount of money involved isn't that large, just over 100 USD when converted. The company likely spends a lot on promotions, so it's doubtful they'd risk their reputation over such a small amount.[...]
To be fair, the amount is not just over 100 USD, OP has converted the number they wrote from VND to USD, it's 82mio VND, roughly 3,200 USD.
I thought the balance that appeared was the actual amount, as you can see.
that's 70,888.51, and my conversion on that was over 100 usd.