I had the following program that our tech support people used to check quotas. For lack of anything better, I called it "magicquota"
You can easily do this by putting your tech support people in a "quota" group, then:
chown root magicquota chgrp quota magicquota chmod 4750 magicquota
Now only your tech support people (or anyone in group "quota") can check other users's quotas.
See the attached magicquota.c for the code.