Henry Sasme it says in phone book.

This guy has been calling my work for over 6months either hangs up on me or says's hello in a very quite voice and then nothing.

Also, calls the voicemail and when it's busy he'll put ring back option when the line is free it dials back to him.

It's a older man hard of hearing I'm sure. But, it's an almost everyday occurance.
Unfornately can't block the number.