What we need is some agency that could keep track of all the phone numbers and who's calling whom and…

In an email from USA.gov telephone scam involving fake government benefits:

Even though the woman wrote down the phone number of the caller, it can be hard to trace it back to a real person because of tricks like caller ID spoofing. This means that she probably won't be able to get her money back.

…oh, wait. OK, maybe we need drones that would keep track of people's phone numbers…