想追人找數

Thanks for your repayment to the debt that we received on [date]. However, it brings to our attention that from the record, there is another debt at an amount of [how much] which falls due. Please arrange payment to us at your earliest convenience by [when]. If you have already settled this debt, please ignore this letter.

中譯 (大約)
閣下於[幾時]的還款已收悉。但由我們的紀錄所見，閣下仍有[幾錢]的款項仍未歸還。請您盡快於[幾時]前安排還款。如您已安排還款，請無須理會此信。

(I) asked for the payment of two debts last week--one was settled but another was not. I am going to ask for it again.