I hate scammers! Hate them, hate them, hate them!
I have a three pronged attack when they call.
Step #1 - Before they even finish speaking, I say, "I don't accept telemarketing calls, please remove my name and number from the list."
Step #2 - Ask to speak to a supervisor and complain of harrassment.
Step #3 - Tell the scammer things s/he didn't know about his mother and a horse named Lucky.