The “Do Not Call” list is meaningless. Telemarketer scammers completely disregard it, and sometimes set up shops in places like the Seychelles Islands. One of the biggest offenders is Roy M. Cox, who runs that “Cardmember Services”.
Many times I see a message of missed calls on my cell phone and if it is a number I do not recognize, I do a Google search for it and then add it to my reject list in case they call again