This lucian literally said to slit our throats

Did you report them? It's kinda important for the system to find them. Make sure you include a description if it was for pre or post game chat.

Also be aware of the fact that it's the person who last reported a person that just got banned that gets the "a person you have reported has been dealt with" message.

{quoted} I don't know what to say about riots punishment system

I do. It simply doesn't work.