After the informal stage, if you are still unhappy with the situation then a formal complaint can be submitted. This is where you can pursue the complaint with the School Secretary and it will be assessed by people independent of your situation. One important thing to note is for a complaint to be successful, there will generally need to be evidence to support it. It would be a good idea to have a think about if there is anything you can provide in support of your complaint, such as email communications. You can pursue the complaint alone or in a group. You can also skip straight to this formal complaint stage, if you do not feel it was appropriate to approach the individual involved via the informal route.