I have received no fewer than 20 calls from this number in 7 hours. It's annoying and scares my wife.
When I ask who is calling, they hang up. It's silent on the other end. Whoever is doing this should go to jail.
Net Research Service. Public opinions survey. Just called the number back and the recording had the nerve to say "we're sorry if this call (as in singular!) was an inconvenience." I'm calling back several times and leaving messages and letting them know how annoying it is.