I have received over 200 calls from different phone numbers and some of those numbers have been use multiple times this number was one of them, occurring in one year 2014

This call comes in a day or night multiple times,  when phone is answered -nobody ever speaks

Someone claiming to be from a mortgage company that had bought my mortgage and wanted to set up my payments with them. My mortgage company has not changed so I believe this was an attempted scam.”

This number calls me every day, never leaves a message. I have called back and no one answered but a voicemail. I left a message telling them I am not sure who they are, but next time they call, leave a message because I don't answer unknown calls. It has been months, no voicemails, still constantly calling.