I would love to know as well. I get a call from this number everyday. Never any messages. I finally answered and when I asked them to take me off the list they cussed me out.

Also got a call from this number they have called daily for almost a week.  When I answer they never say anything and just hang up.  Tried calling it back and all I ever get is a busy signal.  It is a Google Voice Number.
984-538-0    NC    BANDWIDTH.COM CLEC, LLC - NC    998E    CREEDMOOR    RLGHNCHOX2Z    08/27/2014    Prefix Type: CLEC  Switch Name: N/A  Switch Type: N/A  LATA: Raleigh NC (426)  Tandem: N/A

Hangs up when I answer and calls every day. Did ask for my daughter who is 16 yrs. old. Told them she was at school and they hung up.