Welcome to the Community @andrewp,
According to the Australian Consumer Law, that HN Franchise ‘owns’ your problem. If they fobbed you off I do not understand why Consumer affairs ‘cant do anything’.
Numerous HN franchises have been fined large amounts for misrepresenting consumer rights and their obligations (eg fobbing off customers).
A burning smell is not exactly not fit for purpose, it is a failure. Without knowing more the best advice I can provide is related to
Search the Community for the Australian Consumer Law, ACL, and Choice advice regarding your rights and have a read.
If you are not satsfied with how you have been treated you will have to write formal letter of complaint per the ACL and deliver it to the manager at HN Dandenong. The letter has to include what you bought, what is wrong, the responsibility for same under the ACL, and what you want and by when as if you were a silk arguing in front of a magistrate.
If HN Dandenong continues to fob you off (and as a practical matter LG has not fixed it) you can take your letter to the ACCC/Consumer Affairs and make a formal complaint regarding violations of the ACL.
Please let us know how you proceed, or if you need further pointers, and the outcome.
