called twice in the past week.  no message left.

I keep receiving calls from this number and they never leave a message.  I screen my calls so if a name does not appear on my ID or I do not recognize the number I let it go to voicemail.  If they call repeatedly and do not leave a message I know it is not someone I wish to speak to.  It's extremely aggravating that more cannot be done to protect our privacy.  I get an ungodly amount of calls from charities that do not take our number off their call lists even after we have asked them politely several times to remove our name.  Sadly I cannot block every unwanted call...