I'd go with the polite but increasingly insistent. I tucked away DD's scores for years but just in the last couple of months have been "analyzing" them and googling etc. I'm so shocked at how much I didn't understand, not even what the subtests were testing or revealing.

I didn't know anything about "extended norms" and it's too late for me to go back and contact them to better understand what those ">99.9th percentile" scores mean...?