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I know where you're coming from. These callers are indeed annoying and very harassing. It is important that you report them to the FTC and to the Attorney General so they are investigated and hopefully get shut down.
And I suggest reporting their phone number to http://www.callercenter.com, too. People should be aware of their unethical phone behavior and at the same time, get an idea how to handle such calls in the future.
"It's The Best Time On Earth To Be A Writer" by James Scott Bell, The Kill Zone
10 Tips on Writing from David Ogilvy (or How to Avoid Sounding like a Pretentious Ass).
"Why Agents Say No to Your Project" by Janet Kobobel Grant, Books & Such
"How to Make More Time for Creative Writing" by Melissa Donovan, Writing Forward