To the Principal,
Subject: Returning Library Deposit.
I hope this message finds you well. I want to let you know that during the 2015-2016 academic session, I was a student at your college. I successfully completed my F.Sc. studies under your guidance, and my roll number was 719.
I'm writing to request the return of the deposit I made for the library. I have followed all library procedures and returned all the books I borrowed. Could you kindly process the refund of my library security deposit? I intend to utilize this money for my other educational needs.
I greatly appreciate your assistance in this matter. Thank you very much for your understanding and support.