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I believe you remove the write bit from the directory, which should prevent them from changing the file name or deleting the file.
So chmod g-w directory. The read and execute bits need to still be set to allow them to read the directory. Make sure the file still has write permissions for the people who can modify it (chmod g+w filename). And make sure the user is part of the group.
You could enable the sticky bit on the directory containing the files you want users to read and write to but not delete (unless they are the ones who created the files). This can by done by doing something like,
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