If your visa has been cancelled, then once again, you need to appeal against this decision to the Migration Review Tribunal. You must appeal within the 28-35 day time period. If you don’t, then you won’t be able to appeal against this decision, and there will be a real chance that you will have to leave the country. Please make sure that you are seeking review within the prescribed period of days.
Usually, the visa has been cancelled because the department of immigration thinks that you have lied about something that you said in your visa application. In most cases, the department of immigration is required to give you an opportunity to explain the apparent lie before they cancel your visa. Often this opportunity is not provided. If you did not get this opportunity,. Then you can use this as a ground of challenge at the Tribunal.
You must get a migration agent to represent you at the Migration Review Tribunal.