Called approximately 15-20 times asking for a person who has never had this phone number.  I told them every time and they continued to call.  When I asked to stop calling me they acted as if they were offended.  I then asked to speak to a supervisor who hung up on me.  Admittedly I wasn't the nicest person in the world but I wasn't intentionally rude either.

Calls Multiple times a week... never leaves a message.