I tired to remove Mafia Wars application and install it again to change my character but it won't delete....?

..it won't delete my profile. I'm currently a Mogul and want to be a Maniac and the only way to do it is to remove the application from my facebook but when I install it again, my profile remains, why?I tired to remove Mafia Wars application and install it again to change my character but it won't delete....?Next week.