I get several robocalls a day, along with Microsoft tech support scams, and IRS scams. The calls get forwarded to Jolly Roger Telephone bots that engage in inane conversations with the pests.
From Jolly Roger’s website: By keeping the bad guys busy, you keep
them from pestering other innocent people, and you hit them where it
hurts most…their wallets…because no matter how hard they try, our
robots won’t ever buy anything.