I am also a NRA member and also was getting these calls finally got mad and called them back,,,they are the NRA but if you listen to the recording at the end of it they will ask you if you would like more information press 1 and they will ask you what number you would like removed.
The CID said WS Banker, not NRA as another reported. Never heard of 'em so didn't answer, but comes from the same exchange as a lot of spam auto warranty/interest rate scams. Not legit?