The only solution? Answer the phone in an over the top comedy accent, such as Simpsons characters, or just whatever comes to mind.
A terse, altered "Hello" is all I say. Sometimes I don't say anything. Most humans would wait a few seconds then prompt with "...Hello?", whereas bots tend to hang up after ~2s silence
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When it is a human scam caller, what I sometimes do is to say "Hello" and then, when they start talking, and I can already guess they are full of shit, I act as if I am not hearing them properly and say "Hello?? Heeellooo? Hello?" Then they hang up lol.
I just don't answer the phone. If it's important, they can leave a message.
I actually fucking do this, and have done for a year or two. Sad state of affairs.