3 calls yesterday and another one today. It is DEAD Air. You pick up and no one responds.
Tried claling back and number is not in service.
I would recommend filing a complaint with the FCC. being the number is "not in service" whomever it is is using a VOIP phone and mirroring the Caller ID. Meaning that they have a bar bones line that is for outgoing calls only and they manipulated the code to make it appear as if there is a number so call block (unknown callers) is averted. Better chance of getting through.
There is a way to trace it, but you need significant resources to do it. It isn't easy. With enough complaints, it will more than likely get bumped to the proper authorities to investigate.
https://esupport.fcc.gov/form1088/consumer.do