A process called spoofing and with neighbor spoofing the number on your caller ID is meant to look almost identical to yours to increase the likelihood that you pick up.
They are also narrowly trained for specific applications and thus fail badly when outside the limits of that training or in response to " spoofing" by adversaries.
In an elaborate spoof, he signed a document in which he expressed the sincere desire of the Paraguayan government to establish diplomatic relations with the bogus country.