I have 3 papers published online, but they are not indexed, even though they are Scopus-indexed.

When I contacted the publisher, I got this message: "Kindly be advised that our production team is working to finalize the accepted articles and we are experiencing an unanticipated delay in production. Once all the articles have reached the final production process, the publication of issue will be scheduled and notified." Already, more than one year has been completed. What do I have to do now?