Legally Amazon had a contract to deliver you an item. They failed to do that, so you should have reported it as undelivered. When this has happens to me Amazon usually spend a few days “investigating” if the courier misplaced the item, then they admit it wasn’t delivered and send a replacement.
If you report it as “delivered but there’s something wrong with it” then that’s going to trigger them to request you return it, and if you return an empty box that’s going to lead to the “customer failed to return item” pathway.
I've worked in quite a few eCommerce companies on the fulfilment side (although not Amazon, but including Amazon sellers) and this is pretty common - the overwhelming cause is that a scammer buys a product from an online store, takes it out of the box, replaces it with rocks or something of a similar size/shape to make it weigh the right amount, then shrink wraps it to make it look like it hasn't been sold and then returns it for the full value.
However sometimes customers also lie and say that they received an empty box, when they actually had the item inside.
It is very rare that the manufacturer will ship an empty box (however it does sometimes happen).
Because of this, most eCommerce companies adopt a policy of "If the 'new' item was previously an unopened return, allow the refund, however if not, do not allow a refund". eCommerce companies track this by using different bins for returned products (or at least by not returning that product to a bin with the same SKU that is non-returned). This sucks for the customer if you are one of the unlucky people that gets a box sent empty by the manufacturer, but fortunately that's very rare (it's a tough one to resolve without lots of theft, as it's very easy for people to say that the box was empty and very hard to prove otherwise).
This is even more difficult with third party sellers, as Amazon may not have full visibility with how they are tracking returns, and those third party sellers may have different policies around 'received empty' returns (I've not seen the above in any official policy, but can confirm it is common practice - again not with Amazon but I've worked with a number of eCommerce companies with similar issues and policies).
An exception to this is if it’s shipped by Amazon, as I believe they have in-line weigh scales.
Amazon as a company though is almost impossible to deal with if you need to do something outside their regular processes or procedures, and they are heavily bureaucratic from an external perspective (including to their ‘partners’). I suspect you have unfortunately reached a block on their internal flow chart that says “no refund” and the customer services operative has very little discretion to do something different.
I have starting curtailing purchases from Amazon, and ordering from any alternatives whenever possible.
My only experience with Amazon support was a failure to deliver a $600 item, Amazon not only refunded the price right away after we figured out what was going on, but also credited me $100 for my trouble.
Comcast? HAHAHAHAHAHAHAHAHAAHAHAHA.
Raw parts in, good parts out is easier and safer than usually putting in raw parts, but sometimes putting in refurbished parts. Imagine you need something as insignificant as a replacement SIM tray, a replacement for the bent SIM tray ejector pin, and the scratch protectors, stickers, and box labels that need replacement to get that in and out. The scratch protector plastic film might be automatically applied from a massive roll as the case is conveyed out of the coating machine; it's not made to be hand applied. How would a technician guarantee that it's just the SIM tray that broke due to contamination in the injection molding machine and not a problem with the spring contacts inside the phone? The SIM ejector pin probably costs less than a penny and is automatically inserted in every hardware pack that are stuffed and weighed automatically to a fraction of a gram; do you have a technician inspect each one or just throw the old parts away and replace the whole bag?
As a controls engineer, I work hard to make sure that a knowledgeable operator can run my robotic manufacturing cells with minimal waste. The first 80% of a cell, the no-faults "happy path" takes not too much time, but I have spent hundreds - probably thousands - of hours of my life ensuring that my cells are as flexible and fault tolerant as practical. But it's really hard. Customers are always on-board when it makes financial sense, and often when it makes environmental or ethical sense, but sometimes the laws of physics and the Pandora's box of automation just require some waste and leave a particular process untenable.
It's pretty bare bones, but the problem I was trying to fix was that it took me a long time to browse the Amazon Warehouse offers trying to find the best deals. Amazon doesn't make it easy since they don't show the new and used prices side by side if you search directly under the Amazon Warehouse category. There is also no way to sort by discount. I wasted many hours until one day I decided it was faster to spend a few weeks automating this process.
Edit: saw replies, I'll just say it's Monday morning and leave it at that.
I think you have some data problems.
> Used products generally do not come with a manufacturer's warranty but all of our items are backed by Amazon’s return policy. If you would like additional protection, you can purchase a warranty from Square Trade to cover certain items.
Maybe there are better consumer protections in the UK?
"All Amazon Warehouse items are covered under legal warranty for 1 year. If your item becomes defective after the Amazon return period, Amazon will repair any defective item, and if a repair is not possible, we will refund the purchase price in accordance with Amazon's Returns Policy."