This is a collection agency. They are looking for someone who is using my phone number. I have told them the party they are seeking is not someone I know. Despite that, they call me back. I am going to report them to the authorities.
This is one of the masking numbers used by a nationwide collection agency called Checkcare. The California office is located near San Francisco in the 925 area code. When you block their 925 numbers, they call from spoof or tie-in numbers from area codes nearer to where your phone is located. They also use 800 and other toll-free numbers. You can tell they have no valid claim because their recorded messages include the line, "This is a call for" --pause, electronic voice -- "no...name" -- pause, resume first voice --" with regard to check care matter..." and a mechanically reported file number.