27 points
They should be legally required to refund full purchase price plus interest in every case. If there are legal fees to get compliance, multiply that plus the refund by five.
2 points
Luckily/unluckily (because effort), in Australia, consumer guarantees on length of time you can get a refund are vague.
E.g. it doesn’t matter that a fridge’s manufacturer warranty is only 2 years, you expect that to last longer.
With effort, you could probably get a fridge fixed like 5 years after purchase with some badgering / threatening small claims.
Bricking your product would probably fall under that category.
This is wild speculation, not a lawyer.