I answer my phone by not saying a word and let the scammers sit there and wonder what’s going on. It wastes their time and saves somebody elses.
It also causes the autodialers to hang up and move on to the next number. The ones that start a recording can be hung up upon, and the number blocked (though they use so many false numbers you can't get 'em all).
You often have to say something to trigger the handoff to a human to waste their time. I usually say hello in Russian, Arabic, German, etc.
I also press whatever number needed to get a human. If everyone did that it would make their autodialer useless. Instead of them using the autodialer to filter down to the perhaps 5 scammable people out of a 1000 they call, that they have to at least provide human labor to several hundred dead ends per thousand. Even if I don’t have time or interest in talking I don’t want them to get the benefit of the autodailer/recording.