Do you have an answering machine or voice mail? If so, I've heard you can begin your outgoing message with those three tones that you hear before a prerecorded message saying the line is disconnected, and that will automatically tell the telemarketer's computers not to call you anymore.
Otherwise, if they get your machine, they just try back. Sorry, I don't remember what the tones are called, but you way wanna try it. There are only a few big clearinghouses of phone numbers these guys use, so from what I've heard the illusion of your phone being disconnected will eventually propagate to all of them.
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