Caller ID showed this number and "Dassel MN" as the name. The number had been showing up on my home phone for several days, so I answered to determine if it needed to be blocked.
The caller identified himself as Frank Carlson(?) from JC Christensen and tried to verify my name and address. I gave him no information, but I did think that I might have a debt with this company so I asked him to provide me with a switchboard number at his company where I could call him back. He said, "Just call me back at the number on the Caller ID." Then he hung up. I looked up JCC and saw that they do have offices in this area code, so I called the number. Instead of "Frank," I got a pre-recorded advertisement about mobile phone insurance.
So the great likelihood is that he has no connection with JCC and was just another no-conscience jerk working for an illegal no-conscience business, angling for a bank account number to rip off me and everyone else they call. My mistake in calling that !@#$%! number means I'll probably receive double the number of scammer calls in the future.