I keep a VERY loud whistle next to the phone. These assh*les call every couple days about duct cleaning. I live in a rental apartment! The landlord takes care of all that garbage. No matter how many times I told them I don't have freakin' ducts they kept calling. Now every time I hear someone who sounds like a Rajesh claiming to be 'John Smith' I blow the whistle into the phone until they hang up. They hang up pretty quickly.