Just a reminder, the default policy in the country right now is that if you're investing in cryptocurrency, you basically have to bear the consequences yourself. Originally, there's a legal principle that bad actors shouldn't profit, but the overall stance on cryptocurrency investment is that it's illegal (any investment contracts are invalid). To discourage people from reckless investing, the current approach is pretty passive. However, if the amount of money involved is significant, you can try reporting it as fraud to the police. Filing a lawsuit in court is basically useless...