This was an automatic temporary ban applied by our bot due to the usage of a racial slur. The ban has already expired and you should be able to access the server and play on it once again.
Please keep in mind that we treat anyone who uses the same key as a single individual, and you are responsible for whatever actions are taken on your account. I can see over the course of the year that you've been playing here, this is the very first penalty that was added against your account, so hopefully you are telling the truth and this won't happen again.