If Bitcoin is legal in your country then of course you can complaint direct to the government agency and ask for an assistance for you to arrest the scammers but even if Bitcoin is not ban in your country in which they use Bitcoin platform to scam people then still they can be arrested for Estafa case complaint because cheating and stealing are against the law in which subject for prosecution. Except if Bitcoin is declared illegal in your place then the government will not help you about Bitcoin scam but instead you might be arrested of joining the investment.