[2019] Why don't toxic get people get banned?

In my 700 hours of playing, i thought it gets less toxic at higher ranks. Now playing on champ 2 and i've easily reported over 200 people so far and people are stil the same toxic piece of sh*ts who abuse quick chat or just trash you via text chat for absolutely no reason. It's especially funny when they bash you for a mistake they made. Why don't these people ever get banned? And i don't mean chat ban, but having their account banned from playing because chat banning people for 24h will not ever change anything. The devs are literally such a joke not to take serious action. f*cking cancerous.

Edit: I will not reply any further, if you disagree with putting more effort into banning toxicity, you're not helping the problem at all. Serious insult and quick chat abuse should be perma banned and not tolerated like it is now. Bye.