Respected Sir/ Madam,
With due respect, I am __________ (Employee Name), working in department __________ (mention your department). My ID number is __________ (mention your ID number).
Respected, I have been working as _______ (mention your current role) in the mentioned department and along with this work I am also handling the ________ (mention additional responsibility) as ___________ (mention reason). This is to request you that, as I am already managing the said responsibilities, kindly consider changing my job title.
I shall be highly obliged for your kind consideration and quick response.
____________ (Contact details)