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.
Got a SCAM mailing today offering a 'free' vacation: flight & hotel for two from "US AIRLINES" which is ENTIRELY BOGUS even though it SOUNDS similar to several LEGITIMATE airline names. It gave the number 855-879-8217 to call, which I DID NOT. Then, I got the call from THIS number, with Caller ID saying "FLORIDA." I suspected it was BOGUS but let it go to ans. machine, just in case, as we have family in FL and traveled there this past winter. No message left and online I found that this number is connected to the tired old 'Free Cruise' SCAM. LIKELY one and the same.