Random Ban Someone Help Unban please

If there are any riot employees on this server please someone help me unban my account, it's been a year since i've been playing this account and I have spent more than 300 USD and 1000+ hours of game time on this account, today I just got a random 1 year ban and I have already went to riot support webpage but they haven't replied. Does anyone know if there is a way to get unbanned?