We understand how frightening these phone calls can be for you. I have been in your shoes. It sounds like you have been exposed to Spoofing. Spoofing is not caused by an error in the network or your phone. Spoofing usually happens when the calling party uses a paid service (like Spooftel, Spoofer or Spoof Card), which allows the calling party to change the message sent as Caller ID. We recommend that you follow this link http://bit.ly/2yhDVpG to be able to file a complaint of concern regarding this situation.
Did you give any personal information to anyone over the phone during this call or any other that you were unsure of who it was?