Why should it be any different here than back home. If folks want to quit their jobs at no notice and disappear without telling anyone then that is their right to do so. The job of management is to ask themselves why this happens. Either the employment they offer ain't all that great for the employees or they are employing the wrong people.
I agree with this 100%, but Thais do not reflect and ask "why this happens?" when confronted either with loss of staff or looking at the results of a motorbike crash. It also seems to be a standing tradition to lie to foreign teachers and disregard verbal and written agreements. Unfortunately, American employers do the same thing, so I believe it's up to every individual employee to draw his/her own line in the sand. If the school refuses to provide non-imm B support, then I'd haul a** outta there. If the school asks me to cover 5-10 classes/year as a period sub, I'll do it. Not every issue is worthy of starting WWIII, but some issues are indeed deal breakers.
Certainly, if the school wants to hold your diploma, there is a way to finesse your way out of this. "I keep my diploma in a beautiful frame in my room, please give it back," or stand there with a crowbar and say, "So sorry, which file cabinet do I start with?"
