They know more than your phone number and it is not random. They know your name, address and want to know your birthdate, or verify it. What else do they already know?
Questions leading to survey are manipulative to talk to who they have pre-chosen in your home. This eventually manipulates the data collected and skews results.
They will also send you a postcard pre-printed saying they are sorry if we upset you. Must have happened to them a lot to have a special card already made in anticipation.
Too much smoke from these calls and they are harassing.
This is NOT a very professional company even though their postcard said so.
Beware.... their motive is very questionable.
Caller: Scarborough Research