My paper was accepted for publication in a journal. I have also received an acceptance letter and even I have filled out the copyright form. The corresponding editor first told me "Your paper is published in one of the volumes of 2017" and next time said that my paper is "published in 2018", but now I have received an email that my paper is "rejected because the paper is not in the aim and scope of the journal"!!!
Really I do not know, what should I do?