Complaint or objection Complaint Are you unhappy with the service we have provided? If so, please let us know. Contact us by telephone and we will try to find a solution together with you. Find out more about making a complaint Objection Do you disagree with a decision of the CAK? If so, you can contact us by telephone. In many cases you do not need to lodge an objection. We may be able to resolve the issue quickly and easily. Find out more about lodging an objection (only in Dutch)