I never answer a call from a phone number that I don't recognize, but if they are indeed one of these Indian scam "pharmacies" I am sorry to inform you that if you have never placed an order with them, someone using your phone number surely has...and that goes for me too
"I always like to call them back and toy with them for as long as possible, pretending to be an interested and involved caller. That is the best way to retaliate."
Very cool. I do the same thing. String them out for as long as possible, just to eff with them.