If you pick up an unknown caller and there is no one answering, just keep hitting ##### and this is supposed to delete your number from their system. Don't know if it really works, but its worth a try. I get about 4-5 of these type calls daily even though I have registered with the do not call bureau.
That's because this number is SPOOFED (NOT REAL, a FAKE NUMBER that is sent via a COMPUTER to your caller id to DISGUISE the real number - often from OVERSEAS SCAMMERS).
THIS IS THE MARK OF SCAMMERS - THIEVES.
Good thing you didn't get through; you might have been charged HUNDREDS of dollars for calls to certain countries that charge $500/minute or MORE.