To avoid "yes" recordings, I answer the phone with "<indistinct garble> speaking!" When I hear a human I adopt a creaky old-person voice. This old person tends to give their credit card information slowly, and remember that they're using the wrong card after about 14 digits.

Eventually I change back and tell the person that they're working for a fraudulent business and should worry about whether they're going to get paid, and should strongly consider getting a new job.