Hello K.Patcharin,
Good day and trust you are well.
We understand that the customer will be making their payment this 25th of June. Can we ask for your assistance to inform the customer to include below invoices on their payment as it's already long overdue invoices.
However, if the customer claims that there are issue , maybe you can help us to identify what are those so that it can be channeled to the right department for resolution.
They are good payer however these past dues must be dealt with so we can clean up their account.
Can you give us a feedback by Monday so that we'll know if we can make progress?
Your support will be greatly appreciated.