Безопасен ли arbitron.com?

These people will not stop calling! Have no business with them, no sign ups, no nothing! They even proceeded to call me 3-4 times on a Sunday! They do so at all times of the day and night as well! We are on both State and Federal Do Not Call Lists too! Sent us an envelope with a note in it about doing a survey and inside was a $1 bill for out time, but the bill is suspicious big time and is a mint condition 2009 bill that left a black in imprint on the printer paper the letter was printed on too!! Like it was freshly printed, the $1 bill that is! Taking it to the bank this week to have it checked out!