Caller: Know idea but not impressed

Brand new number exclusive for my hubby and kids only to be able to reach me (if in meetings and it rang would assume urgently family crisis as no one else has the number ) however 3 days into new service got a missed call, no msg from this number . The number looks dodgy and doesn't belong to my kids so didn't answer but who and how have someone got my new silent number already Harris's ING me .....wtf ...over it , seems u cant win and have a phone number for just family......