Please do keep us updated. I just read through that thread you posted, seems like you now have their store credit? What good is store credit?!?
Take it to the disputes tribunal. There is a fee (you cant claim it back or refund it) but it varys according to the value of the phone. for $400 it might be as little as $25.
You simply fill out the form explaing your claim, and send it off. They well send you both a summons,and sit you down in a room with a ref to sort it out.
My advice, is to fill out the form, and wait till you get your summons in the mail. Then call up and talk to Tayne (as thats who the summons will be deliverd to), Explain to him that if you simply swaps your store credit for cash, like you should have been given in the first place, you will cancel the claim.
If he declines, disputes tribunal will absolutely find in your favour.
In any case, once you have filled out your disputes tribunal form, write a letter / email to fairgo, and explain to them all of the above. Im positive they get 100 complaints about them a week already, so you might be lucky in getting a response from them.
Hope this helps!
Matt (who's last disputes tribunal win was for $4200)