Can somebody advise me on what to do here?
Lawyer up... potentially sue the LLC. Anything else probably puts you in a worse situation.
Sue over 40 shares?
Well, they were worth more than 1 BTC per share at IPO - over 180 Leu is also something, isn't it?
Also depending on your insurances (you can insure against legal expenses quite cheap), something like this might anyways be covered. Reporting at the police as the bare minimum is surely free and depending on your country's standing with the US could also already create some attitude changes in the LLC that holds our shares hostage.
Also if you fill these forms, if Giga goes down, you're going down with him. He has an LLC - do you?
FWIW 180 Lei would buy you a modest lawn mower, so I guess it's something. The problem here is that while banks give away free toaster ovens with any new account, lawyers do not give away free lawn mowers with every new customer.
They also cost something like that to just read your case description. And by something like that I mean more than that.