PSINET (Telstra) is a major web-hosting organisation. It's unreasonable to expect their staff to know about specific issues with one of the hundreds of thousands of websites which they host.
However, they may well take action to remove a site if they're notified that it's trading illegally. Email this address
[email protected]
and tell them that
(i) the site is trading illegally by not providing a postal address ;
(ii) the site has broken Nominet's rules by registering as a non-trading individual ; and
(iii) you believe that the site is trading fraudulently (because you've not received your goods or had any reply to your emails).
Chris