Subject: Warning for Disrespectful Behavior
It has come to our notice that you resorted to unprofessional and rude behaviour in the workplace on [DATE]. Further, we have seen such dishonorable practices from you frequently in the last __________ months/weeks.
We would like to inform you that this behavior is unacceptable as per our company policy. Further, this behaviour is also considered as misconduct on your part which is a violation of our ethical code of conduct.
Your Manager has already discussed with you on this matter. We are sending this official written warning to you. If we do not see any professional behaviour from your end in the coming days, you will be subject to disciplinary action as per company policy.
We recommend you to treat this matter with utmost importance and seriousness. You are advised to change your behaviour at the earliest. Note that a copy of this letter is attached in your employment record.
Looking forward to seeing a drastic change in your behaviour.