Calls six days a week, sometimes twice a day. Never leaves message.

Calls me once a day for the last few months. No voicemail. I called back for the first time and it was a man who said he stationed in India who works for AMR... the ambulance service. I hung up. I believe it's a scam.

Calls every day and leaves a silent message. Sometimes multiple times a day.

I believe it's a scam. They started calling daily without leaving a voicemail and I would ignore it,  but today I picked up and an Asian lady from a company called American something something, started to ask me for my date of birth while I was telling her that I was at work and was not interested. She insisted on asking for my DOB I told her not to call me again and I hung up.