You did the right thing. Sonia should have checked what's the arrangement offered by the Principal. This kind of attitude problem owner who thinks they are some godly level elitist can fark off. Trial class is really no big deal. My kid's school offered trial class for a week. Who the hell intends of making money from trial classes? Trial classs for one day? This is a long term school. Not some extra curricular class. TS did the right thing.