I let it go to voicemail. No message.

I just got the same phone call yesterday and twice today. I have no idea who it is and it sounds like they keep changing their name and everytime the call is lost. But they somehow knew the name of my brother and kept saying it was a curtesy call.

I keep getting calls from this number, but when I answer, there is silence, then the call is dropped.  Does anyone know who the heck this is, so I can get them to stop calling