If developer change bug status as “Rejected” still it is reproducing, as tester what should u do? can u raise bug as “New”?
→ I guess you should just reopen it and again assign it to the developer team.
For any reason the developer might not be able to reproduce the bug or doesn’t get what you wonna tell him.
I normally have a discussion with the developers and tell them why I think that the Issue I raised is a bug.
Either they accept it as a bug (and will fix it) or they can explain/convince me why it “works as designed”.