Who called from 3072576213

I just got a call from this number, so I picked up the phone and didn't say anything.  Nothing but silence, so I hung up.

I'm on do not call list yet they keep calling!

I am on DNC list did not answer.
Caller  ID said Gillette, WY
I don't know anyone in Gillette, WY

I'm registered with DO NOT CALL and get repeated hangup calls on average of 4-8 a day!
This # says nothing. They hang up when my answering machine kicks in.

You must report the number to DNC list.  Signing up for it does not automatically stop unwanted calls.