Symtech (Thailand) paid to contract

Symtech (Thailand) paid to contractor,But didn't withholding tax.
Please see attach file ( Pink hi light )

So,Symtech (Thailand) should to be
1. Refund from the contractor for pay to the Revenue Department.
Or 2. Symtech (Thailand) pay withholding tax to the Revenue Department instead contractor.

Who is Lan Vincint ?
I don't have information about Khun Lan and Khun Sinjai.
Please send information about Khun Lan and Khun Sinjai.
Request Copy of ID card of Khun Lan,Khun Ton,Khun Methee and Khun Sinjai for fill in the form PND.3