Dear Mr. Harry,
Thank you for your letter dated 1 March concerning our Statement of account. We checked the account and discovered that our clerk had entered a wrong amount in the books, which explains the discrepancy between the statement and the invoice. I apologize for causing any inconvenience as a result of our error.
Here I enclose the corrected Statement of account. Thank you.
Muhammad Abdul
Finance Manager
Encl.1. Statement of account