Navigate to riotgames.com. Never use third-party links.
If you were banned for chat, write a genuine, respectful appeal to Riot Support. Acknowledge your behavior. "I called my Jett the N-word" is a permanent ban. But "I was frustrated and used mild profanity" might be reduced to a 7-day suspension on a first offense.
A top service offers a "Ban Warranty." If you get rebanned in 7 days, they respoof for free. If they don't offer this, they know their spoof is detectable.
