Trending @Accenture; Project Roll-off

My project is ending in few days but my manager tagged me into another project without informing or asking me. Today I suddenly got to know about this and I don't want to be in that project,,,I said this to my manager as well,,,but I don't think it will work.How to deal with this situation? Whom to reach out? So in Accenture we don't get to chose or deny project!!!!!! If anyone could please suggest me a way to get out of this mess!!!!