Opportunistic and *********

Bought a Logitech gaming keyboard from them via their online store. Received it a week later. When I opened the box, I realised that the keyboard layout was not suitable for my line of work as a writer. So I asked if I could return it and change it for a more suitable keyboard design. At first, I was told that would arrange collection. Then I received a follow up email stating that because the box was opened, it couldn't be returned. Opened, NOT damaged. All the packaging is still 100% intact. I even sent photos to confirm this at their request. Which online store expects a customer to know what they're getting if they're not allowed to open the box to see the item? I'm sure this violates my rights as a consumer under the CPA. Anyone know how I can take this further? The keyboard costs well over R1000.