Keep getting a call from this number on my cell.  Most of the time they hang up. Today there's a voicemail but it's inaccessible, which is weird because if I check an old voicemail I can check it fine.  They've been calling for a week now.

I got that same call today (12/1/14)...hopefully it's the last one from there. No voicemail message.

STOP CALLING ME

Just received a call at work from them. Caller ID says "HSF". Picked up the phone and there was silence on the other end.

Same as others report. When I answer the call, I hear several seconds of silence despite multiple times saying hello and then it disconnects. Hasnt left a message.