Dear Kevalina,
Good day.
I am glad to inform you that the seller has replied.
Thank you so much for your contact.
I checked it for you,but we are sincerely sorry that we can not contact with the local post office.
In normal condition,the customer do not need to pay for the shipping fee.
So for this issue,we will request the customer would pay for it first,and you can refund 7 THB from our account.
I think it is the most convenient way for both the customer and us.
Best regards
Kindly inform the customer regarding the sellers response with regards to this concern and extend our apologies for any inconvenience caused.