I've been submitting complaints to the FCC here:
https://esupport.fcc.gov/ccmsforms/form1088!createConsumer.action
I recommend anyone getting calls from this number do the same. If they get enough complaints, maybe they'll take action and put a stop to this illegal and annoying activity.
I get a call from this periodically. I have relatives that live in the State of Washington and see the call listed as "WA" and have to wait to see if they leave a message which this caller never does. It had an obnoxious sound the first time I answered and then learned not to answer it. I had to call my uncle and cousins to let them know to leave me a message so I can know it's them and for me to call right back.