received call 01.02.2017. Did not leave message. Don't know who they are or why they are calling

Received another call 01.03.2017. Again did not leave a message.

Received call 01.11.2017. Did not answer and they did not leave message. I've been getting a call a day from local numbers (I suspect the numbers are spoofed) in the last 3 weeks. I don't answer callers not in my contacts, but I did answer two of them thinking they were businesses I know. Both times I got a fast talker trying to get me to agree to a "free roof appraisal" because they would be "working in my area". BTW - my area is rural acreage and my neighbors are cows, so doubtful this was legit.

Received call 01/18/17 at 10:07 a.m. I did not answer and they did not leave a message. I don't know this number so I assume its spam.

Received two call 02/07/17 did not answer no message left