I can tell that I've made reports too (in my case for plagiarism) and nobody handled them. Sometimes it just happens... You may have to insist more and do as you think it's better.
Violation in plagiarism is usually not marked with a negative tag. You just need to provide proof of plagiarism, for which they are actually punished with a complete ban.
One thing to remember when you create a post about plagiarism, you must also submit a report to a moderator. This almost always works flawlessly.
As the moderator himself recently said:
And as a very general info on behavior when you find abnormalities.
The thread here can be used as a reference - But the decisive factor is the click on "report to moderator" because in my opinion none of the mods actively reads this thead.