Nikhil,
Pooja Nukani is right.
If you have the habit of writing diary of your day to day activities at your office, that will help you very much in this regard. You have show that diary/activity note book to your superior and it will be taken care. For your surprise you will be getting more that what you have expected. Do not try with letters as it damage your image and will create negative image that you want to start a union sort of set up.
M V Muthu
Chennai
9962298084