Let me start with what I understood with this question a defect/bug that is
opened by tester to which development team has not handled since 1 or more
builds and is not rejected by developer because of duplicate or differed.
If I am correct The defect might be a low priority one due to which
developer is giving less importance to fix because of fixing the high priority
defects.
If the defect is a high priority one even then development team is ignoring
it then what generally as a tester whatever defect I have raised I have to
make sure that it is fixed in the coming builds and more over in weekly team
meetings I need to give the status like how many defects are still in Open state
and what is the reason behind why they are not yet fixed if they are not fixed
since 2 or more builds so for these kind of defects I need to contact concerned
developer and inform him that it is not yet fixed since so and so builds and
explain the impact of that defect due to which other areas are not covering
while testing and request him to fix it as soon as possible.
If still he is not handling the issues then the issues will be raised by the
team lead with the high level management in their day to day meetings and
forcing the development team to fix the issue that s how we can handle the
things.
Plz correct me if I am wrong
And one more thing in your question you have mentioned Re-opened from tester
side could you give more clarification on this . I am asking this question is
because you said development team is Ignored the defect if it is correct then why
do we reopen the defect.