Writing a letter to any one asking for information or documents needs to be supported by reason and purpose. How can some one write for you without knowing the details? It would have been better if you had made a draft and placed in the Forum for correction from grammatical and language point of view. However, accepting that you are new to this forum, a draft letter is placed below for you.
June 13, 2008
Z City, South Africa
Sub: Surgical operation of my daughter in your clinic.
I invite your attention to the subject noted above and would like mention that I did not get the receipts of all the expenses made in connection with the operation and treatment of my daughter, while leaving your clinic. Since they are urgently required here I would request you to forward the same to me indicating category wise expenses as indicated below.
1. pre-operation examinations and treatment
2. Surgical operation
3. Post-operation treatment.
I shall be grateful if the required documents are sent to me at the earliest. As advised by you my daughter will again visit your clinic in August to have a further check up.