First. It is way to early, particularly this year, to be thinking that USNA has made any final decisions on Candidates. Second, as CAPT MJ notes, there is a tandard process for notification , and this is WAY OUTSIDE that.
I am usually pretty understanding and forgiving, but have a hard time accepting this "NROTC Marine Option person's" action. Is this an Officer recruiter? If so, I am a bit skeptical that they would have a list of USNA applicants at all (particularly this year -- the BGIS system isn't even fully functional yet), and expect it is highly unlikely that they would ever receive a list of USNA turn downs. Further, no one but USNA should be notifying a candidate of their turn down status. I think the Recruiter's action was inappropriate at best, and the "oops, I made a mistake but didn't have time to call" response after he was called on it suggests something more nefarious.
I recommend that anyone getting a call that states or suggests that they weren't admitted to USNA without receiving official notice from Admissions email their Admissions Counselor, with a cc: to the BGO, including details of the call (including the identify of the recruiter and contact information if possible).