The 703 area code is the right one for Fairfax, Virginia, where the NRA headquarters are located. One of my daughters used to live about a mile from Waples Mill Road, where the NRA building is, and her fiance had realatives working there. If someone is calling pretending to be the NRA, then they may be phishing and trying to get financial information from you.
The do-not-call list does not keep companies that you have done business with from calling you, or their business partners. Also, political and charitable organizations are exempt. Still, it is better than not being on the list.
What really frosts my cake is the companies that send out fax messages. Not only do they waste your time, they also use up your ink and paper. One company may have a number of phone operations, and each one has to be notified individually to stop them sending you faxes. On the other hand, if you document that they continue to send you faxes after you have notified them not to, it is possible to collect from them for each incident, or they have to pay a fine to the FCC. I kept a log for our volunteer fire department for a while, but was not able to catch anyone, darn it. It would have been easier money than having to do another fund raiser.