Thank you for your report of possible fraud via ind.nl. The Immigration and Naturalisation Service (IND) takes this kind of reports very seriously. Your report will therefore be treated with the utmost care.
An employee of the Fraud & Enforcement Department will assess your report within 5 working days. Is your report concrete? And is there a reason to investigate? Then the department will start an investigation.
Possibly, the residence permit of the person or persons are withdrawn. Or the sponsor will be fined. The sponsor is the person that wants the foreign national to be in the Netherlands, for example, a family member or an employer. The sponsor can thus also be a company. In that case the company will be fined. Does the investigation show that there is a criminal offence? Than the IND will report this to the police.
You will not get a reaction of the IND anymore. And you will not receive information on the consequences of your report. The EU General Data Protection Regulation (GDPR) does not allow this. In this Regulation rules are set out on privacy. The IND can only give information on personal issues to the person the case concerns. Or to his representative.