Having looked into it further it looks like at least part of their operation is being managed by The Hut Group - from some contact info - and I found this surprisingly similar link from four years ago.
Hard to say really to what extent there is overlap here.
Honestly I'm now starting to wonder if I should pull the article - getting it read is good, but this is more attention than I expected and I'm getting a little nervous of what'll happen next now. :-S
Don't be daft. Leave it up. As long as the article is truthful, what's the problem? Their appalling treatment of an honest customer should be exposed.
I do think you're totally overthinking this. They made the initial mistake, they need to correct it and at their expense.
They can't do anything to you. Make a "best effort" to return the item and no more. Keep a log of all your correspondence. Don't waste any more than a minimal amount of time on this, certainly don't take days off work etc to wait for couriers.
I already have taken the day off work, and the courier has now collected the Switch - so the hope at least is that I'm now done with it, albeit out-of-pocket.
I'd agree with the other comment above - if what you've said is true, leave it up.
Years ago I had a situation (with a music technology hardware supplier) which just wasn't getting resolved; as soon as I made a website publicising the issue, they were bending over backwards to get it taken down; I said that I'd take it down as soon as the issues were sorted.
They never were (the product died) - but I'll never forget the threatening phone call I had one Saturday morning. I knew I had nothing to fear as I'd just documented what had actually happened and nothing more. It may not be the same in the US (and I know you're in the UK), but in the UK I think that there's still the ability to complain loudly about something as long as you're being truthful. Looks to me like they screwed up three times, and it's all on them.
http://www.bbc.co.uk/news/technology-25330615
Hard to say really to what extent there is overlap here.
Honestly I'm now starting to wonder if I should pull the article - getting it read is good, but this is more attention than I expected and I'm getting a little nervous of what'll happen next now. :-S