Silent call attacks are annoying, but it's only making me stronger.
You're absolutely right about the endless silent phone calls. They were targeting my city's area code last year and when they called me I took the chance to play around with them and insult them a bit. Initially the guy just called me back and manually insulted me in hilarious mangled english. But after a week that stopped and since then I've been getting ~5 silent calls a day from random numbers. It's super annoying.
On the plus side it's given me the motivation to learn VOIP. I've set up my own SIP phone system with a DID number from my area. I'm slowly learning how to get detailed information on who's calling through what. I already knew enough computer tech to mess with them. But now I'm not far from knowing enough phone tech to do so.