>> said Hello, and there was a dead line...no one answered back <<
Usually this outcome means the scammers have computers that are programmed to dial dozens (or hundreds?) of numbers simultaneously.
Then, whoever answers first — even by a micro-second — will have the “privilege” of talking to a live person.
On the other hand, if you pick up your phone just a tiny bit later, the computers will drop you — plus everybody else who had been called during the current “cycle” — while the live person at scammer HQ works his charm on the unlucky first answerer.
Thanks for the info.