Leaver buster got it wrong

in matchmaking in aram my client froze and wouldnt let me do anything, which means i was playing kassadin with 17 armor pen, so i close the client and reopen it and lo-and-behold its doing updates, well heck i said, so i wait for the updates and log back in to find that the match is still ongoing, so i reconnect with my troll runes on kassadin and actually become the entire reason my team even wins that match. why did leaver buster bust my chops for 4 games when i never left a game, i won it.