You have a complaint about a Commonwealth Government department, agency or service... We cannot help you with your complaint but there is another organisation that may be able to help you. Complaint about... Go to... Commonwealth Government department or agency, including Centrelink, Child Support Agency and Department of Home Affairs. Commonwealth Ombudsman Postal operators including Australia Post Commonwealth Ombudsman Australian Taxation Office (ATO) Inspector-General of Taxation Australian Passport Office (APO) Australian Passport Office