Which campus were you at? Huangqi or Shishan? I was in the Primary section in Shishan many years ago. I've never seen double standards like this. The school expects teachers to honour the contract to the letter of the law and even the smallest breach like being 5 minutes late once will likely get them punished with a "fine". However if teachers work more hours than contracted or don't receive free Chinese lessons per contract, the school gives them nothing in return and if they complain they accuse the teachers of being unfair and selfish.