Please create a new account "Vkontakte". To do this you need another mobile number and the mailbox is not tied to the site – according to the rules of "Vkontakte" you can't have two accounts. Logout on the website and click "Register". You will have to specify your name and surname, sex, school, where you studied, and the University (these steps can be skipped if you intend to use the new account only to write a letter), then click the "Complete registration". Enter your mobile phone number along with the code. On it you will receive via SMS text message code consisting of four digits. By entering the code, you will be able to become a new user and write a message. Of course, you have no guarantee that your new account will not contribute to the black list.
To remove yourself from the blacklist user, you need to make sure that the person was held at http://vk.com/settings.php?act=delFromBlackList&id=*** where * * * is your id (you can find it by going to your page and looking in the address bar). For example, you can persuade the friend to send him this link. After the user of the site will pass through it, it will automatically remove you from the blacklist, and you will be able to write to him. However there is a caveat: he will notice that unban you and if you wish, can deny you access to the page back.
This way you can go from the black list of the group "Vkontakte". Just send admin a link http://vk.com/groups.php?act=unban&gid=***&id=###, where *** is the group id (can also see in the address bar while on the page group, and # # # is your id. The administrator will also receive notification that it has removed a user from the ban list, but if people on the black list a lot, you are unlikely identificeret and banned again.