The current incumbents aren't perfect, but that's no reason to vote against them.
The do not call system is not perfect, it cannot stop determined criminals or scofflaws. But it does work as to those telemarketers who obey the law. Occasionally there are prosecutions under the do not call law, but they can't get everybody. Prosecutorial resources are limited.
The fact that institutions and individuals are not perfect doesn't mean they are somehow totally worthless.
Got the call. My usual treatment of a call I do not recognize is to pick up the phone and NOT SAY ANYTHING. Usually, if it is a robo-call, I will wait 15 seconds and then they will hang up without saying anything. Hmmm suspicions confirmed. These robo-calls wait to hear someone answer and then they start the recorded "spiel". After hanging up, I go block further calls from this number using a Pro-Call blocker from Amazon.