An unexpected error occured while logging in. WTF (2)

Riot dont let me explain to me again. This is the second time *take a deep breath that this happened. Seriously someone from Riot gave me a solution and it worked, But plis seriously look into this. You need to look at this deeply. I dont want some guy just refresh my account by syncing and changing my password. Not a very long term solution to me. Just plis fix this Riot.