Do not wait more than a day, and go formal.
The contact numbers on this web site might be helpful. Some of the ‘complaint contacts’ obviously are not very useful.
The MD is Mr.Terry Smart.
Their corporate mail is The Good Guys Corporate Office, PO BOX 5190, South Melbourne VIC 3205
You can get contact information here (if you register)
and some parallel information from this older topic (and subsequent posts)
I believe the OP was stonewalled and do not know if he got a satisfactory or any outcome or even acknowledgement. He apparently sent a registered letter to the Niddrie address that either is an incorrect address, or they decline to collect registered post since registered post is often a legal document they might not wish to deal with.
Hopefully you have a better idea what you might be dealing with if they have not improved.
