Actually those "3 tone" devices that are sold on TV work. The tele-marketer makes a call and whenever they hear the standard 3-tone "out of service" sound, your number is canceld from their list.
A simple handheld tape player will do the trick too. The only problem is, EVERYONE who calls you will have to deal with that 3-tone sound until you are confident that you are completely erased from the tele-marketer's system.
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