May 31, 2017
Did any of the callers mention your name?
If not, then the callers are simply dialing all possible numbers in an area code + exchange hoping someone gullible will fall for their scam. I get a call a week, on average, on my unlisted and unpublished cell phone number, from scammers who are calling for suckers. Most of these don't call twice.
There is nothing special about your phone number; any person or any dialer can call your number, accidentally or on purporse. What is special is the association of your name with that number. You have done well to protect that little bit of data. And that is why you should let most unknown calls go to an answering machine or voicemail.