Website down please help

What is the name of the domain?

phatreturns.com.au

What is the issue you’re encountering

website offline

You don’t have a DNS record for phatreturns.com.au
https://cf.sjr.org.uk/tools/check?508e96824c814ac6aeabb8a1d5ffac2f#dns

www redirects to phatreturns.com.au so fails for the same reason.