I had a telemarketer call me once and I just hung up without saying a word. He called back and startd to get on my case for hanging up on him. I hung up again without saying a word.
My sidekick told one "Sure - hang on while I check."...left on hold for three minutes, then I picked up and asked the guy if he'd been helped and he said, "Yes - John's getting the serial number off the copier".
I laughed and told the clown, "No wonder John ran off to the public library - that's where we go for our copies".
I never answer the phone anymore.....
.....and I alway hang up on them if I somehow end up talking to them because somebody else answered the phone and gave it to me.