Just lost a game to a Jayce 1v5

Their voli forgot smite. I get his buffs I kill him early I kill jayce early. Syndra gets a killing spree on their mid teemo. Our bot lane just kinda went even as I picked up Ashe kills. This was a sure win. But then jayce starts killing yasuo under tower and walking away with full health. Jayce takes top tower with yasuo on it. Jayce gets his second kill of the game on me. He teleports bot, he's 4-1. And as you can imagine he scaled into a disgusting unstoppable tanky bursty fighter tank back like mage. And he ended with like 20 kills completely winning by himself. I've never been so disgusted with the game and a champ. I know we all hate vayne but please, nerf this guy too