They might not be spoofed, they could be coming in over an international line and the Caller ID doesn't know how to display it. It could be coming from a call center in Laos (which has an international calling code of 856, followed by a 2 digit area code and a 6 digit number), and is being "compressed" into a domestic format...
I get the same thing... call from "your utility company" Ace Electric, calling to say you can save money on your electric bill. I just hang up, since I do not have "Ace Electric" but PSE&G. I have gotten 5-6 calls from the Ace robo-caller.