i know someone who was 'hired' via online interviews, everything seemed great and actually made quite a fast effort to get there, turned down another job, waited... and they never returned his calls or messages for 2 days. Finally he lets them know he's in a hotel and needs to know what's happening and gets some message saying that they decided he wasn't suitable. Pressed for some explanation they seem to suggest a female manager decided she was suspicious or disliked some personal issue (like him being married or something like this).

To my mind it seemed very vindictive and both the people (who might be Y and B??) but they came across as fickle, snotty, nitpicky and then there was that 'personal dislike' part which squares with your account of the 'firing' turning into mean-spirited personal attacks and lies and suspicions etc.

It's interesting I stumbled across this post and yes it was Real English Foshan and yes I believe I might even know the people you mentioned (but not the teachers).