Anyway, you can comment about calls from certain numbers and to let other users know what to expect from that number at Harassing Caller Report site. Go find out who owns that phone number or who is pranking you!
Probably it might be normal that you often receive annoying phone calls from annoying callers but I have never received a call like uses obscene or threatening language, or even heavy breathing or silence to intimidate me.
However, I received an unwelcome email today.

If you are too lazy to click on it to enlarge, here's what he wrote:
"hi dear,have seen u in facebook,will try to be friend w u if u don mind..kindly text me a msg to my email ok,or u can drop me down u hp no so easy for me to contct u soon..keep in touch dear,god bless u..hear from u soon ya..reply me ya dear...don jst add me ya...."
oh well, do I look THAT stupid?!?