Zedwork

I refused a fight and got kicked and can't join anymore, so have I been banned or is it just MC's temp-ban in action?

(Also sorry if this is the wrong forum)

You were banned for your antagonistic behaviour, specifically not returning an enchanted diamond sword when told to and "destroying" it for the owner's "arrogance".

So... do I ever get unbanned if I apologize or *something*?

The point of a ban appeal is to either prove that the ban was unjust, or to prove that you understand why you were banned, believe it to be just, are remorseful and can make a positive contribution to the community in the future. So far I have not seen anything along those lines.