MN Cello Partnership DBA Verizon Wireless review: constant robocalls

My phone is ringing sometimes every 15 minutes with either "unknown caller" or from numbers which I have looked up on the internet, and it states
"cellco partnership dba verizon wireless - mn"

I have to turn my cell phone off, because I this assault of constant phone calls. I am on the "do not call list".

What can I do?

Verizon claims they can do nothing.