awasdee ka Khun Ae,
My staff Ms. Gift, accounting officer, has brought to my attention that this invoice is still not yet paid.
I ask you kindly to please present the cheque of 26.264 THB as soon as possible.
The invoice was due 30/9/2014.
Your upcoming invoice #2014-09-12 amount 13.587 THB is due 30/10/2014.
Thank you for your co-operation.
Kind regards,
Catrin