Hello @kz-r thank you for reaching out to us. Players can appeal a game ban on their account and ask our agents to double check their ban was applied correctly, by creating a support case with us. Please note, you can only appeal a ban once on your account once however.
If you would like to appeal a ban, you can get in touch with us about this, via this link > https://www.ubisoft.com/help/contact
We are unable to discuss players' bans in our forum in detail, so this thread will be closed. Thank you for understanding.