salary increment letter

i am working at a school since one year i have small salary qr.900 day by day increasing the living cost and i am facing very difficult to maintain my daughters cost and still we try to get familiy visa . i am glade to inform mr .fonseka chairman of the school he tolld to me can give the school visa but still nothing hapan any thing.i now request you to consider my case for an increment and i like to work as a assistant teacher now i am working as a teacher assistant.