Dear K.Wacharit,
Refer to our conversation few hours ago, we are confirm to pay you include input vat, then we will refund from RD Dept.
To ensure that no problem will occur, please provide us the evident of submitting VAT and receipt also.
Normally we use the free zone privilege , so we pay only the goods or service and no need to involve refund from RD Dept.
Please be careful for next time to avoid the mistake n aka.
Best regards,
Chidchanok P.