Hi RyukoProp
You may submit a ban repeal on our Discord server. https://nexuscore.us/discord
From there, you can create a ticket. Please be aware that most servers that run IW4M Admin have server-side anti-cheat turned on. If you are banned from a server but able to connect to other servers then you are not client banned. You would just be banned from that particular server.
We apologize as there is no way to display a way to appeal the ban. We have requested this feature from the creators of IW4M Admin and we are on their time.
We'll await your ticket if you choose to submit an appeal.