Please refrain from unilaterally marking the issue as "Completed" even though it remains unresolved.

This response could easily be interpreted as dismissive of users and is highly unprofessional. I cannot help but question the fundamental attitude of your support team. It is the customer who should ultimately determine when an issue is “resolved.” If your support team is to mark a case as resolved, it should be based on clear and reasonable criteria—such as when there has been no response for an extended period after a reply was provided. I strongly demand a sincere and responsible response.