Dear Soumit,
Please do not understand him wrong, due to you do not have office in TH and we also cannot bill to you via DSV office in HKG so normally if you do not have credit term with us, we have to request for cash on delivery,
For your case, please kindly suggest to me how you will arrange the payment from time to time when you can sell to customer in Thailand.
Looking forward to hear from you soon,