Hey there,
It appears that you've triggered one of the server's grief traps. It is an autoban by the console, so you'll have to wait it out. We would have been able to help if you were banned by a moderator.
We have griefer traps to deter griefers, the people who destroy and/or pillage other people's builds.
Try not destroy blocks that seem to be unnatural / made by other players, and you'll be just fine.
Sorry I couldn't help more. During the week, you're still able to vote for diamonds, which you will receive on login (As long as you have space in your inventory).