can someone help me unbann my account
If it is a suspension you just wait out the time
If it is a true ban I think you can't do much..
you can't stop a ban.
You can prevent them, though
If you did something bad enough to get banned what makes you think;
1) you are special enough to deserve coming back
2) we would want someone like you back at all.
3) you are so worthy of other peoples time they would even consider trying to get you back
I'm sorry about your banning. You can try submitting a request at https://support.leagueoflegends.com/...s_requests/new.
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