Hello, my friend. There is nothing to worry about.
While firertc WILL work with law enforcement if their users are committing a crime, they will not just give your info out to random people that ask for it, like these scammers. The scammers just wanted to scare you into not calling them anymore, so do just the opposite! Call them twice as much!
Never be scared off by a scammer's threats unless they actually tell you your address or something.
If you were a scammer, the only thing you could do to prevent calls would be to threaten everyone with stuff you'll never do. That is exactly what these guys did.