Who called from 7028262000

Caller I D said "Plus Four Inc"  I don't answer unknown calls like this.

This obsessed nut calls CONSTANTLY.......Luckily I don't hear the calls but can see online...LOOK here.
And those calls are just from this morning.

Blocked, Number     (702) 826-2000     Mar 13 10:18 AM
Blocked, Number     (702) 826-2000     Mar 13 10:18 AM
Blocked, Number     (702) 826-2000     Mar 13 10:18 AM

Blocked, Number     (702) 826-2000     Mar 13 10:18 AM
Blocked, Number     (702) 826-2000     Mar 13 10:08 AM
Blocked, Number     (702) 826-2000     Mar 13 10:08 AM
Blocked, Number     (702) 826-2000     Mar 13 10:08 AM
Blocked, Number     (702) 826-2000     Mar 13 9:57 AM
Blocked, Number     (702) 826-2000     Mar 13 9:57 AM
Blocked, Number     (702) 826-2000     Mar 13 9:57 AM

Don't answer the phone it is a collections agency

I DON'T KNOW WHO IT IS CALLING SO I GOOGLED IT AND SAW ALL THE PROBLEMS.  THEY ARE NOT IN MY CONTACTS SO I DIDN'T ANSWER.  THEY KEPT CALLING.  THIS IS a brand new phone and number.  I don't understand how they got the numer.  I just want them to stop calling .

got call on new  cell phone number  No way they would no who I was