Called my dads phone 7 times today with no messages left

Called three times today so far no message.

Got this call on our home phone.   Have no clue who it is,   leaves no message,  and when it comes up on caller ID as Livonia,  MI    we have no clue who it is or why they are calling.    WE also get these phone calls on our cells at work.  Who are these idiots and why do they keep calling especially from another state??

Had 3 called and no messages today.

I don't usually answer but did because we have an alarm and our power had been out so I thought it might be them. It wasn't. It was an alarm company that was going to be in our area.