Telescammers often ask for you by name. "Hello, Jeff?" Say, "I'll get him. Hold on a moment." Scream JEFF really loud into the phone. Wait 10 seconds and say, "Here he comes". Wait another 10 seconds. Then, changing your voice, "This is Bruce. What can I do for you?" If he asks for Jeff, repeat the whole charade. If he goes into his sales pitch, wait until he's done. Then say, "Oh, I think you wanted Jeff." Repeat the whole charade.