AIG Director interview questions

I was contacted by Head Hunter and then HR team. First several phone interview sessions went well: they were professional including both very technical and behavioral questions, which made me try further. However, after that, many happenings occurred. First, the hiring manager forgot calling me even after very careful confirmation work among me, HR and head hunter; second, the hiring manager called w/o making appointment when I was in a meeting to my current board member; w/o any apology, the HR/Head Hunter persuade me to have a on-site interview, which was a start of jokes....