We are writing concerning a payment of $12,600 for invoice number KJ678 which is now overdue. A copy of the invoice is attached.
According to our records, the sum of $4,500 is still outstanding on your account
Please send a bank transfer to settle the account, or an explanation of why the balance is still outstanding. If you have already dealt with this matter, please disregard this email.
We could appreciate your cooperation in resolving this matter as soon as possible.