It's over, guys. False alarm.

We went to the authorities, and after some investigation, they found out that the "gangsters" that almost extorted us aren't even in this country.
Yep, they traced the calls to a public phone in Honduras or something, which only explains that they got our number randomly via the phone directory.
Apparently, this is a regular thing. It just hadn't happened to us before. Con men get your phone number randomly out of the phone book and try to muscle money, goods or favors out of you. Some have a little more tact than the ones who targeted us, but the idea is the same. Trick you into putting money into a bank account, or go out and buy them some phone cards, or put bags of money somewhere.
They don't even have to be in a gang, they just put up the gangster guise to make it easier to intimidate you.
And I totally fell for it.

I'm terribly sorry to have raised such a fuss, but I was completely terrified. I was scared for my family, my life, my possessions... I just didn't think straight and I ended up with my feather ruffled.
The idea of them being a part of a bloody, violent and relentless criminal organization didn't calm me, either... But we are all better now.
We're still careful about who we talk to and give our new phone number, though. You can never dismiss anything.

I thank you for your concern and advice and prayers. This has proven to me without a doubt, that you are all my friends. :3