This number and very similar numbers are constantly calling my cell phone which is reserved for family & friends. I don't answer and never will.
As JoeyDee said; You are wise to block the caller by whatever means you have. You probably won't be able to find out who it is that's calling, as they are calling from spoofed numbers, maybe from overseas.
The call you received was a phishing call, looking for valid, active phone numbers to try to scam. The DNC does NOT call people, nor can you register your number on the DNC list by pressing a button on your phone.
You are wise to block the caller by whatever means you have. You probably won't be able to find out who it is that's calling, as they are calling from spoofed numbers, maybe from overseas.
Sounds like they're calling your cell phone. Go to your phone's app store and find a call blocking app. There are lots of them, and most of them work very well. Some even have their own databases that will block calls automatically from numbers that have been reported as scams. Good luck.