Depends on my mood.
Sometimes if I'm bored I'll play along. I had one girl ring me up about an offer for some share of mine. The shares are worthless and it's not worth selling them. So anyway it goes on and on and on. Well she does whilst I'm away in the kitchen making a cup of tea, and ocassionally picking up phone to say yes then put it down. Get to the end, and she says do you want to sell your shares then? I say well, if you can put it all in writing and mail it to me I'll have a read and think. But but but, it's a special offer only now on the phone. Well no then. A bit of back of forth, then she burst out with "You completely wasted my time you bastard...." , to which I reply "Well you are the one who rang me up". At which she slams the phone down. If you can get the scammers to lose it then slam their phones down, it's a small victory.