A Letter to Demand the Payment of Overdue Account

Dear Sirs,

We have received your letter of March 2 with thanks.

As requested, we are enclosing a fresh invoice for our services offered on August 25, 1994, previously billed under our invoice No.829, which you could not find.

Since the account is long overdue, we would very much appreciate your prompt processing of payment on your side.

Yours faithfully,

參考譯文：

     我們已收到你們3月2日的來信，謝謝。

    遵照你們的要求，我們隨函附上一份新的發票，即有關我們于1994年8月25日提供的服務，此前我們曾開出第829號發票，或許你們沒收到。

    由于該款逾期已久，我們將萬分感謝你們立即處理付款事宜。