The do not call registry does not apply to businesses. We have been receiving foreign calls from the same "local internet directory" company about our "free listing" for a few weeks. On some occasions they call 4 or 5 times a day. This is after saying NO and hanging up everytime. Is there a deliberate strategy of multiple callbacks? If you don't listen to the pitch, is this counted as an incomplete call, only to have them call back over and over? Jokes aside, what is the best strategy to prevent this?