Who called from 9712569676

Recently started getting 1-2 calls a day from these numbers:
(971) 256-9589
(971) 256-9676   Left an almost silent voice mail…. just a low volume, med-high pitch whine
(971) 256-9393
I do not answer unidentified or unknown calls, ever, period.

Started getting calls from these numbers two years ago:

(971) 256-9392
(971) 256-9393
(971) 256-9589
(971) 256-9675
(971) 256-9676
(971) 270-2635
(971) 340-4267
(971) 340-4269
(971) 717-3702

At first, they were sporadic; just 1 or 2 a month.

Then they stopped for a year.

Now, damn it, they restarted last month and are calling about once a day.

Research has turned up conflicting info.... unkown number, T-Mobil, landline,

telemarketer, phisher.  So, I've no idea who/what/why.  And I don't answer numbers I

don't know or expect.