Who called from 7277712951

Calls lunchtime and leaves no message.  On call back, recording says # out of service.

Calls leaves no message, and hangs up when you answer/

This number is a computer! It calls about once a week and there have been already to different names on the caller ID but usually unknown.

The caller id says Inez Herrera but I don't know any Inez so I didn't answer

I keep getting calls from the following numbers and no message left, although they wait until my answering machine picks up and then hang up.  Don't you think after calling every day during day hours they would get a clue that they person is working?  why not leave a msg, obviously because they want money?  do you think they'd run out of numbers they use at some point to be annoyomous?  the numbers are:  727-771-2951, 713-955-5577, 305-368-8883, 541-200-3592, 323-281-1438, 215-381-5815, 317-300-7927, 775-219-8813, 972-728-0074, 345-497-4394, 312-473-6015, 345-492-2591, 345-490-2627, 345-495-4077, 972-591-5266, 345-494-0034, 210-547-2845