Winnings cannot legally do that. It is their problem under the ACL (p19). You should ‘call them out’ on their abrogation of responsibility and have it in writing, and report them to your state fair trading organisation.
In contrast with your experience I recently had an issue where the manufacturer said ‘out of warranty’, $435+shipping for the user serviceable part that was the problem. There was history to the product, not germane here. I sent a pleasant ‘Letter of Complaint’ to the retailer including the history, who intervened and arranged the part at no charge. That is how it is meant to work.
edit: various Harvey Norman franchisees have been fined for making similar claims about ‘not their problem’. You might quote this to Winnings.
