You can show them the QLD ACCC page etc that "No refunds" is none applicable and should know that it does not apply, especially for items waited for a reasonable amount of time.
When there is no response, it means its up to you to escalate. The decision is entirely you but noted once you escalate to the bank it probably means your account with the retailer from their end will freeze. But at least you get your money back. If you paid by Paypal, you might be out of luck and would require to escalate through your credit card provider directly as Paypal will not entertain purchases over a year.