can someone help?

i got banned, apparently for griefing, i havent done anything of the sort :/

1. Reason why you were banned? No idea
2. Who banned you? No idea
3. When were you banned? yesterday i would think
4. Why do you want to get unban? i love playing on this server and i wouldnt grief it, ive been doing lots of building and planning out some building projects, i havent done anything wrong.
5. What have you done to help out? been playing alot with snail and shock, i really didnt do anything :/

UPDATE: ok i know what it was now, it would appear my little brother played on my account, and he says that he took some iron from the spinnika? this is what he has told me, ive changed my password now and never leave him with my account, im sorry this has happned and i can promise 100% that something like this will ever happen again.