Unknown caller. when you answer the caller hangs up. Call back you get "you were in a servery, but the time has expired, press 1 to remove your self from the list"
This happen to me about 3 weeks ago. I press 1 and still getting calls.
Dun & Bradstreet is the primary seller of the phone number list. I had a surveyor admit this to me over the while she was trying pump me for my political opinions. My political opinions are: I don't do surveys