The rules state “NO Griefing”. I don’t know if you know what that means so I’m going to state it here. Griefing is adding to or destroying part of or the whole of a building, creation or similar which was created by somebody else of which has not give you permission to add or destroy part of or the whole of said creation.
That rule was broken by you. Now I expect, from your understanding, that you know you both broke that rule and expected that rule to not apply to you because blocks respawned. Well, if you’re hitting blocks randomly then I am afraid to say, you’re unknowingly griefing and we don’t account for ignorance of the rules or understanding. As long as you do understand them now and you agree that you won’t break them again, then I am sure that I can unban without issue.