What should I do? The results of the post interview of the back office (credit analyst) of the joint venture insurance company.

If you don't want to waste time waiting, just call and ask. You can also make the other person feel that you are very active and don't consider face. Face can't be eaten. But since the interviewer's attitude is so unprofessional, I believe this company is probably not so good. Check the reputation of this company online by yourself.