Dianne, you will have to follow the below instructions, which I got from the Contact Us page, to get this listing removed.

Residential Listing Removal

Please read the instructions below carefully, as failure to read the instructions may result in processing delays

Residential Listing Removal
Please make sure you include the full phone number (including state area code) in the email. Also ensure you send the email from a personal email account, we do not accept anonymous opt-out requests. Let us know whether you would like the name and address, or address only removed. We only accept requests from individuals with the same surname as the current listing. Requests can take over a week to process - sending multiple/daily emails will not speed up the process, and only acts to slow down requests for other people.
Email residential @ reverseaustralia.com

Please take this off immediately my family are actually hiding from a violent person and have just been told that this is here, take it off now please