The Curious Case of the Pesky Midnight Caller

I am annoyed. I am annoyed because I am being mobile phone-stalked. For the past few days, a mysterious number calls my mobile around midnight. When I answer the person does not say anything. I hang up and the person calls back immediately and does the same thing. When I call them back during the day to spew vitriol and venom, they immediately cut my call. So I have blocked this pesky mystery caller. Unfortunately, my phone still registers their calls and last night, this aimless individual called 5 times! There were 3 more calls this morning. I'm sure my mystery caller is chuckling with glee as he(she?) lays about in his (her?) pjs during the day. After all, would someone who is gainfully employed have such time on their hands? My national service person says it is no big deal. He says I should not worry since this is not America. America or not I have watched too many movies including Scream (loved that movie by the way!). A friend of mine and I had a tradition of going to see all the Scream franchise films on the big screen back in the US of A. Ahhhh good times! The first one was great but the successive Screams just got a tad weird and tired. Anyway, was thinking of publishing my stalker's number online but decided against that. I welcome any suggestions on how to deal with a pesky, cowardly phone stalker!