Have called twice in the last few days. I NEVER answer calls from phone numbers I don't recognize, and they never leave a message. My default ringtone is SILENT so I never hear unwanted calls (family & friends have a different ringtone). Who ANDWERS these calls? You are (unintentionally) perpetuating the problem.
Have called 3 times today (so far), 3 times yesterday, twice the day before. I don't answer calls from unrecognized numbers and they never leave a message. So extremely annoying!