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.
Now, many of us have been on the receiving end of calls from our alumni association, and I don't think the ink was dry on my diploma when my phone rang.
And that also came because we started getting phone calls to the office from homeowners that wanted to, oh, I just want to buy this sofa or this bathtub that I see in the picture.