ADP Software Engineer - Java Developer reviews

I have stayed in company according to company eligible polices for variable pay. but still didn't get bonus, before leaving company even confirmed with my manager on this even he confirmed I will get, but not came. Finally I dropped a mail to manager by keeping senior manger and Indian MD in cc saying that I didn't get bonus. After that my manger replied to me saying that "you got zero bonus due to performance " then I have shocked previous month only I got monthly award for work. how come my performance is bad .. Please verify before joining company who is your manager and is he have at least ethics.