Comment below rating threshold, click here to show it.
An important thing to keep in mind is that a single report is half a teams other players in 3v3. If someone was being offensive only to her own teammates then the most you might get is 2 reports and some people never report and others (like me) are often unable to because their client crashes after every single game.
Read the chat log and judge it the same as if they had 9 reports. You are punishing for the offense not the reports.