Business Writing_The first payment reminder

According to our records, We have not yet received payment for your order number B033898, placed on March 1st, 2011, Below are the details of the order:

Order Number B033898
Placed: February 14th, 2011
Shipped: March 15th, 2011
Items: 8500 sets of AWC
Our invoice number: CI2011030045
Amount due: US$245,00.0

As you know, our terms are T/T 30 days from B/L date. We understand that our invoice may not have reached you, so we would like to take this opportunity to send a second copy of the invoice, along with a copy of your original purchase order. Please process the invoice and submit payment through your usual account at he earliest convenience.

If you have settled the account before this letter reaches you, please ignore this reminder and accept our apologies for troubling you. Thank you for your payment and your business.

As always, please contact me, if you have any question or concerns.

Your truly.
Karl