For the first 30 days they can just reject for any faults.
30 days to 6 months the onus is on you to prove the faults did not exist at time of purchase, presumably you're not disputing it's a manufacturing defect.
The consumer is entitled to one of the following, at your discretion, in the first instance:
- Repair
- Replacement
- Full or partial refund*
They are not entitled to refuse the first two options unless it will cause significant inconvenience, is disproportionate to the cost of the goods, attempts to repair or replace have failed, repair or replacement is impossible, or repair/replacement will take a significantly long time.
https://www.businesscompanion.info/sites/default/files/CRA-Goods-Guidance-for-Business-Sep-2015.pdfFWIW: I have claimed through S.75/Chargeback (the card company I use has the same form for both initially) and they did reach out to the other company for their side of the story. If you are complying with the consumer legislation I can't see them siding with the customer unless you're being unreasonable.
That said, would it cost you more in return postage than the CC fees?