I am a PADI DM, know nothing about the NAUI course. Not saying PADI is better, that is just what my local shop teaches so that’s what I took. Instructors were great and taught me a lot. Got all 4 of my certs there and they were very thorough. Not knocking something I don’t know about, but I am curious. What questions did this guy ask that made him determine that you weren’t trained well enough and that his course was better?