"It Doesn't Matter How Many Times You Report Somebody"
I was playing as a jungler in a normal game, and the duo lane (I suppose they were queued together) were flaming me in all chat and saying things such as "This Lee" every time they died. I chose mainly not to respond, but they continued. I would be on the opposite side of the map and they would cry in all chat that I never ganked. (Not even true.) Then later, the support told me I deserve to be raped. Like anyone else would, I reported the two. However, I haven't received the message "Due to recent feedback, this person has been punished blah blah." So you can only get a chat restriction if more than 1 person reports you, I suppose?