Answer:
The best first step in ordering online is ensuring that you are purchasing products from a legitimate website. However, if you believe you have mistakenly ordered something online you should first contact your bank to request that they reverse the payment, then write to the website and make a formal complaint. If you are unhappy with their response or they do not respond you may be able to complain to the Australian Competition and Consumer Commission (ACCC). You may also consider taking legal action and you should seek legal advice to see whether this is an option in your circumstances.