I don't know who these people are and they won't leave a voice mail. Since I don't know the number and it doesn't give a name of who it is. I won't answer it at all. I did answer a call from a number I didn't know and had to call my credit card company. They some how knew my card number and charged on it. Luckily I got the charge taken off. So don't answer a number you don't know. This didn't start until I bought my new iPhone and I got a new number.
I have been receiving calls from this number for days now. They do not leave a message. My phone is telling me that it is a call center. I decided to answer this time. It is a recorded message about signing up for health insurance. They will transfer you to live customer support who will try selling you the insurance over the phone for a $25 fee. I did not trust anyone who could not provide anything in writing.