Scammers like this do not use a do not call list because they are not legitimate, they are there to steal your money. Do not waste you time telling them not to put you on a list. They spoof the call with fake phone numbers to get them to call your line. Adding to your call block list doesn't work always because they will call next week with another spoofed number. I use call blocking apps, its adds them to the list of scammer phone numbers and if other people using that app have already added the number you wont even get the call.
Robo call. Calls are inconvenient and interrupt my work day. When a human finally answers and is asked to quit calling they simply hang up. I have a phone to talk to people I want to talk to. The DNC list doesn't work.