Don't worry, let's break it down. Since you've passed both the theory exam (with a D grade) and the assignment (with a C grade) in MMPC 004, you shouldn't need to reappear for the exam.However, the "not completed" status might indicate that there's an issue with your grade or evaluation.

Here are some steps you can take:

- Verify your grades: Double-check your grades for both the theory exam and assignment to ensure they're accurate.

- Contact IGNOU support: Reach out to IGNOU's support team or your study center to inquire about the "not completed" status. They can help you resolve the issue.

- Check the evaluation criteria: Familiarize yourself with IGNOU's evaluation criteria for MMPC 004 to ensure you've met all the requirements.

Remember to stay calm and patient while resolving this issue. Good luck!