My hope is that this is training these individuals to be more aware of the issue, assuming they've forgotten about it due to being desensitized or using some paid caller ID spam service that not everyone has access to for lack of funds.
I've also long turned off my voice mail; it's just a waste of time.
I've heard that some smart phones don't let people use my method any more. i.e. you can not set default tones to silent.
I don't like junk calls either but cutting myself off from normal communication channels doesn't seem as if it would be very practical.
And, yes, I do in fact use punctuation on text messages...