Dear Mrs. ...C...
I am writting to you to enquire and to request a prompt solution for the payment due to the over time that I've worked during the school year and in particular during the end of the year show 2009.
In June 2009, I talked to Mrs. ...A... and Mrs. ...B... about the solution proposed by you of increasing my aministrative working-hours from two and a half to three working days to compansate my over time and Mrs. ...A... as well as Mrs. ...B... have already agreed to your proposition.
I talked to Mrs. ...B... last thursday 10th of September and she told me that she has already let you know her agreement for the modification of my contract.
Hopping to hear soon from you, please advise.
My best,
My name