Sounds like the old con where the caller will tell you you owe a fine or back taxes or anything else and if you don't go to Walmart and buy a gift card and send it to them the police will come to your house and arrest you. They can get very aggressive and frightening if you don't know the scam.
This number has called me repeatedly as well. I finally answered, a woman asked for my husband and when I said he was unavailable, she hung up. I called the number back and a recorded message answered "The Campaign Solutions Group: You have been asked to participate in a survey. Please leave a message." Which I was tempted to do but refrained from lowering myself to that level.