Who called from 3170000000

I have received sporadic calls from this number; when I try to call back, just a busy signal.....
Not sure when the call is coming from....I have now registered again for no-call list.
Thank goodness I have caller ID.

Claims to be a card holder service.  I have no idea of what they want because I ignore sure calls.

Calls sporadically.  Does not leave a message.

This number just called.  When I asked to get my name off there list.  I heard what I thought was a recording of someone singing.  I said what the hell?  Then he called me a [***] and asked for a b&^$job.  I said are you kidding me.  (not quite that nicely) and handed the phone to my husband.  It didnt stop there.  More nasty name calling and he said give the phone back to your wife b*&ch.  What kind of business is this?  Who is this company and how the hell do they stay in business?
And how do we prosecute them for harrassment.

Calls but won't speak.  Don't know what company it is but annoying at 9pm