Recorded voice said, "Press 1 if you'd like to lower your interest rate."  So I did.

Telemarketer "Connie" told me she was representing a company named Consumer Services and her callback number was 888 SERVICE.  I asked to speak to her supervisor.  Supervisor "Chris" was not interested in further identifying his company or his callback number, but quite articulately called me an a--hole.  

Complaint filed with donotcall.gov, but neither the 888 number nor the number on the CallerID exist.

Nice way of doing business.

Those random prerecorded telemarketing calls are also illegal. You can report them online to the FCC here:  https://esupport.fcc.gov/form1088/consumer.do