This number is on the DO NOT Call Registry! You have called my number repeatedly for days now! This is a LAW FIRM and I do not have time to continue to answer when I am conducting business. Stop the calls now!

Hmmm.
Interesting.
You supposedly represent a law firm, yet do not recognize WE are not calling you, and you seem to be unaware of the fact that the DNC list is ineffective against certain classes of callers, and is not to be used by business phone numbers (it is for private use only).

This is a discussion forum where one can report or describe suspicious or unknown phone calls, but reporting them here does not stop the calling.  YOU have to take action to do that!  (google is your friend).  Consider buying a call blocker from your favorite store if nothing else works.
http://gg.gg/blockers

Businesses are not eligible for registration with the Do Not Call list and are afforded no legal rights that accrue to residential and personal numbers if they do register.  Business to business calls are expressly permitted and telemarketers selling goods or services are not required to screen against the list when knowingly calling a business number.

Also, the caller is in no way affiliated with this website and has no idea you posted a comment about their number.