The FTC has been protecting robo callers. New York State passed a law to fine telemarketers on a per-call basis if a home phone was registered on a "do not call" list. On the day that law went into effect, the FTC came up with their own "do not call list" which superseded the New York law but relaxed the fines and enforcement. They've done nothing for years. I have personally filed thousands of complaints on-line and they did nothing.
Worse, they gave the list of phone numbers away for FREE to non-profit organizations which are "supposed" to not call them, yet are exempt from any fines along with, of course, anyone calling for political calling and polling.
At the height of abuse, my home phone registered as many as 35 phone calls per DAY. It never stopped ringing. I finally installed a telephone system with a secret extension give out only to people I know personally. Everyone else can leave a message. No more ringing unless I know you. Done.