If You're in a Champ Select That's Being Held Hostage-
I've never really happened to me, but I've seen numerous posts about this in Player behavior. I have the best solution for anyone who is 100% having they champ select held hostage by a troll.
Take a screenshot of the champ select. Use the snipping tool, and put that shit into a Riot Support Ticket. If the toxic player said anything in the chat that shows they're trolling, it's 10x better. If the player actually deserves a punishment, just let Rito do their work.