It is important that you can study in a safe and pleasant environment. Therefore, VU Amsterdam has a policy to prevent and counteract this. To this end, confidential counsellors have been appointed and there is a complaints procedure. Who you should contact depends on the complaint. See below who you can contact for your specific situation.
Please also read the Student Charter of VU Amsterdam. It describes the rights and obligations of students on the one hand and of VU Amsterdam on the other, arising from legal and university regulations.