Bought a travel power adaptor last month from Sydney international airport, didn't work when I tried it overseas
Back in Australia I email Heinemann and they advise to take it into my closest JB Hifi as they're the 'technology partner' for Heinemann. No pre-arranged RMA or anything.
This morning I go to JB Hifi and return with receipt. Took staff 20 minutes to figure out how to process Heinemann warranty claim, throughout the process acted disinterested rather than apologetic about the delay. When they finally figured it out, they asked me if I had the EFTPOS terminal slip that I got with my receipt. I didn't keep that, only my original purchase invoice but I could show them the amount on my electronic bank statement. They weren't interested in that, and said they could only issue store credit for JB.
If I had more time and the amount was greater I would've argued but by this stage I just wanted to stop throwing good time after bad and bought an iTunes card with the credit.
I bought $600 of goods from Heinemann heading out on that business trip (cosmetics and perfumes as Xmas gifts) and due to how they handled this $11 adaptor I'll be saving my shopping for the OS Duty frees instead
/rant
TLDR; keep your EFTPOS terminal slip as well as your invoice if you buy tech from Heinemann with card
Who shops at Duty Free? 9 times out of 10 its overpriced - except alcohol.