I advise to contact Ups Thailand about the payment of duties and taxes.
The shipment was forwarded with the option prepaid, the shipper, Branded in the Netherlands will pay the freight charges and the consignee must pay duties and taxes.
The shipper in the Netherlands can change the biiling options from prepaid to DDP, Free Domicile. (the shipper will pay both the freight charges and the duties and taxes,)
To obtain information about the payment of duties and taxes I advise to contact UPS Thailand: 662 762 3300.
Thank you and have a nice day.