I am from sweden so my english is not good

Someone was hacking my account and griefed or something under my name. Now when I got it back, I can't play on Opticraft! It does only say: The Banhammer Has Spoken! And I don't know what the guy who hacked me did! So please unban me couse I spent really long time on the server, and I want to play again. My friend griefed, and now, after  one mounth, he can play again. I dont know if I should show a picture of that I changed password, (I dont know how I put in pictures) couse I did.                            
                                                                                                                     //xMegaXx