If you were banned by CONSOLE with the reason "Automatic grief detection"
You were banned for triggering one of many Automatic Grief Traps
Antigrief is a system designed to efficiently and automatically ban griefers. Multiple buildings have been placed in undisclosed locations around the world. If you break several blocks within those buildings, the antigrief is triggered and issues an automatic 7-day ban.
This system is highly successful and under most circumstances, a ban appeal should not be posted for such bans.
One you should know that stealing is wrong. In real life would YOU go to an empty house and take a bed for your own house, I guess not so Why do it in a game here.
Also you must have taken more then just a bed for your ban to be issued. So if you would like to explain what you broke and a reasonable reason on why, a pardon might be in question.