Extremely toxic player didn't get banned, does riot ignore tickets or what's going on here.

I got this guy in my game with his premade, in the middle of the game, out of nowhere he started being extremely toxic. Like, to the point where it's not ok. He said he'd skullfuck my mother and finger my deadnan, insinuating he'd kill my mother and have his way with her skull. I wasn't able to report him post game because of the simple fact that I didn't want to play league anymore, I actually uninstalled it. I sent tickets after tickets to riot explaining the situation, I even sent a damn screenshot of him saying those exact things. What do I get? A "we're investigating it".

Oh, haha, I forgot to mention a very important detail. A few hours later, I installed league because my friend wanted to play, we get in champ select and I see the exact same guy there with his premade, he hasn't been banned yet, and that's just amazing riot. Imagine someone saying they'd kill your mother and fuck her skull and riot not banning that person.

Honestly, I don't know why I expect much from a company that is incredibly sexist and toxic to the core. "Parents that aren't disciplined can't discipline their children".

EDIT: I deleted a part of the post because of people not being able to understand comparisons and how to read in-between the line. So I thought more people might make the same mistake.