No response on answering call ... just silence

This number appears on my phone at least twice a day, three to four times a week.  It usually calls late in the evening when I'm just about to fall asleep.  It rang me up today, Saturday afternoon, and I'm trying to figure out a way to piss these people off.  Is there any way we could hack their system and F***k them up and keep them awake 24hrs a day?

I wish I could f*ck their s*** up....pissing me the hell off

missed the call, and was wondering about it.  Happened at 2:45 July 16, '14/

Two calls back to back - no message, can't track using reverse look-up.

Missed the call, no message.