Just got permabanned

im sure you are 100% aware of why you are permabanned

when u open the league client and log on to ur account? does it say anything

If you didn't get chat logs, you should send a ticket to Riot Support. They should be able to let you know what the cause of the punishment is, and what steps you can take to remedy the situation (if your ban is a ban for your protection, which does happen occasionally).

No need to write on the forums, contact support they are the only people that will help you.

If you have any questions, contact our Player Support team at https://support.leagueoflegends.com/home