Dear Kun, With the limited facts, a draft reply has been prepared. You may suitably edit it.
To the disciplinary authority,
In response to the memo no. [insert memo number] dated [insert date], this is my reply:
1. I was really unwell on [insert date] and hence took one day C.L., which has been sanctioned. I resumed duty and was in the office on [insert dates].
2. However, as my condition deteriorated and I needed urgent medical attention, I sought medical advice and was advised three days of rest. (Is the company-recognized doctor). A copy of the medical certificate is attached. I had informed the HR Dept by email, attaching a copy of the medical certificate. A copy of the email is attached to this reply.
3. After the period of rest, I resumed duty on [insert date], but I was shocked to receive the memo accusing me of failing to discharge my duty with devotion, diligence, and care.
It is submitted that the above sequence of events shows that my absence was for genuine reasons and does not indicate a failure to discharge my duty with devotion, diligence, and care. These are serious accusations against my character, and an isolated instance cannot lead to such a conclusion. I have always been honest, hardworking, committed to completing the assignments given, and honoring the commitments made by me.
In light of the above facts and circumstances, it is submitted that the honorable authority may review this reply with satisfaction and consider closing the proceedings.