Who called from 3603506011

No one there when I answered - busy when I called back

Received a missed call from 360.350.6011, no message. Tried to call back, no ring, no pick up, but not a dead line.

When I answer there is just a beep.  It has called me at least 5 times starting at 8 am.  I have blocked the number.

I to get the same thing from this number it calls nothing there when I try to call back nothing.

I just got this in Seattle. Not sure who/what it is or why I'm getting a phone call from Bellingham.