Thanks to everyone for posting re these mystery calls. Got 2 calls from "James Klopp" in the past 2 days. As others have reported, if you call back it says he's "not taking calls at this time."
Thank you for posting info. on this phone number. I have gotten 2 calls today from that number and no message was left. I now know to continue to IGNORE it. I am also on the do no call list. If it continues to call here, I will file a report with the federal gov't. do not call list complaints.