This is a why it's important to ask the range if opp doesn't say it. If opp asked the range and your P responds 15-17 he would know 2♣ is stayman. if he asked the range, you would have had to be truthful and say it was a weak NT. or at the beginning of the hand, you should notify that you play weak NT openings. If i called the director and said your P didn't state the NT range and it wasn't standard 15-18 or so, yes, the director is totally in the right to deny your bid and penalize you somehow.