is this what prank calls have come to?

it's 11:30-something at night. i'm knocked out i suddenly my phone vibrates: "RESTRICTED CALLER"
here's how the conversation goes:
me: hullo?
caller: *whispers* i'm going to kill you.
me: okay.
caller: alright.
i hang up.

i really thought this was a dream - it wasn't.

the next day, it's 5:16 in the evening and i get another "RESTRICTED CALLER" call
me: hello?
caller: *whispers* can i kill you?
me: what?
caller: can i kill you?
me: when you whisper i can't understand you SO YOU FAIL!
i hang up.

oh yes, i'm on to you. i know who you are.