Greetings "liqqq"
Permabans are usually handed over for using :
A) Scripts or any other 3rd Party Program
B) Insane toxicity
C) Getting caught EloBoosting
2 TIMES IN A ROW
D) Getting caught selling your account
I am not an expert in those codes but if you did not do any of the above contact Riot Support with a ticket.
Hope I helped x)