Tambien recibi una llamada de ese numero

This number keeps calling me 2, I have no idea who it is...they never leave voicemail!

So I was on the phone with my girlfriend and this number called me at 12:05 am (pacific time) n I didn't answer they called again one minute later still didn't answer, so once I hung up on my girlfriend I tryed calling it and the answer machine was basically saying it didn't exist, yes I'm freaked out about it, and no I don't have any type of idea who or what it is