With the amount of reports staff members go through on a daily basis I'm not surprised that some of them are overlooked or aren't handled as well as they could be. That's assuming you are telling the truth and the player did indeed RDM you.
If you did encounter a rulebreak that a staff member missed you are free to report the user
here on the forums (assuming you have valid proof of it happening).
I'll come on the server now and help out with the reports.