Rune select glitch/champ select glitch/ laggy client?

Just had a game where I had to dodge because the client became super laggy where i could not select a hero, and when i select it like 10 sec later in the game i get the hero i didnt want and when i tried to select a rune, i got an error message that wont let me change rune. does riot have an email or error section i can report this to?