I got this call and got a similar response. My sister-in-law works at <a big phone company> fraud group and says this is one of a several that they are dealing with and have responded with court-ordered records. She couldn't say anything but I assume that once these jerks are identified, they let violations rack up so they can hit them harder when they go after them.
She also told me that phone companies have to say what they do for privacy reasons but that it's still worthwhile to call and report these calls anyway. There's the law and there's common sense that the squeaky wheel gets the grease. She said to call my phone company harassment line and insist that they take the number, regardless if I have involved law enforcement. So that's what I did :)