the HR insisted my current and ex superior's contacts as their system requirement even though I provided a list of contact from my business partner, voluntary society, my current and ex colleagues.

I guess, the company looking for good ATTITUDE employee. The head of department keep expressing I look good with attitudes and impressed the top & another teammates during interviews, keep informing me that he want to take me and preparing for offer letter.

As their point of view,
Attitudes more priority than talents, skills and experiences.

I do have the company email of the top as the invitation link sent for interview.
But i doesn't feel comfortable now even they reconsider me back since their system are so rigid. i doubt the head of dept dare to challenge their system for my case.

He claimed that the system show all the references that I provided are no positive nor neutral, current employer contact is a MUST.
But one of my ex colleague that contacted by HR and he appraised my work performance. He told me no worry to getting that job as he did his part.

After a phone call from head of dept, i text him immediately and explained should not hear one-side comments only, confessed upfront for not expecting good review from my employers and requested to reconsider for my application from there.

I guess no suitable to pursue further if he cant against the system
Maybe they expecting "prefect" employee with both good attitude and working performance.

If there is such "prefect" employee, u think the current employer will let other new employers to hire them?