Scammer call. They ask for someone that is not there. They leave threatening voice mails but will give no details. They are probably trying a common data mining trick. Don't fall for this, laugh in their face and hang up.
The first time they left a voice mail saying they are from HF Holdings and that I need to call them back urgently. After reading the other posts I'm glad I didn't call them back. A week later they called again and I answered but didn't say anything and just hung up. They were asking for a Marcis Gaus,