Who called from 2016858600

Keep getting calls from this number.
They never leave a message if I don't answer.
If I do answer, no one speaks to me to say why they are calling.
Yet, they keep calling!!  What do they want??
Who are they????

keeps calling, never leaves a message. when I do answer, just silence.

Call and will have up

Received calls from this number twice this week.  I dialed back the number from another phone and received a recording stating 'if you would like your number removed from our system, please press 6', the call is then disconnected.  I'm blocking it on my cell.

I got the same thing.  But I forgot to block them,  I will now. Thanks