How far should I take my concerns?

This week I went to my kid’s school to update their emergency contact information. All of my information was there, but there was this person I never heard of listed as a guardian! I asked the secretary to remove this person right then, she told me she couldn’t, I would have to call the district office. I called the office, they of course told me I’d have to call the school. I refused to hang up until I knew that person was removed, then I followed up at the school office to be sure it was fixed – it was. Now my question is how many other kids have the same kind of snafu on their contacts? Should I go to the principal? Above his head? Or should I just chalk it up to a mistake, believe it is very unusual, and drop it?