Who called from 8154428706

Caller wanted to "lower my Nicer gas rates." I said I was not interested but got 2 more phone calls in 15 minutes

also got 3 calls in a row no left no message

IF YOU RECEIVE A CALL FROM THIS NUMBER PLEASE CALL US AT 8154429931, AS WE ARE TRYING TO STOP THIS PERSON FROM USING OUR PREFIX ANY HELP YOU CAN GIVE WOULD BE APPRECIATED THANKS

Got a call from this number yesterday morning and twice today.  I was finally able to get to the phone on the third call...when I answered, no one responded.  After three "Hellos" I finally hung up.  Has anyone figured out who this is?  It reads as Unknown on our caller id.