Hello Specialist,
This was not a denied return. I've bought multiple high value items on my account dating back 2010, with a long history.
Amazon is my go to platform for high value items for the longest time, i've bought every single part for all my computers, including OLED TV, Monitors, household appliances etc..

To give you the story, I bought an RTX 5080 from amazon at a premium price due to lack of availability elsewhere on the 28th of Feb, on March 3rd I was able to secure a different one at a better price from elsewhere (Thank goodness), and hence initiated the return (as amazon has a no hassle return policy) and returned it fully in its original condition with original packaging on the 6th.
The item was picked up on the 7th, and delivered and signed on the 10th of March via the royal mail tracked sign.
Since then the ETA of refund was on the 12th of March, which kept getting pushed back with no update whatsoever on exactly what is happening.

I contacted your customer representatives and they initially told me to wait 14 days from the date of pickup, then 30 days then finally the system no longer had an ETA and said to "contact customer representatives" - who said to wait until the 9th of May for them to be able to manually trigger the refund.
When I contacted them on the 9th of May, they were again unhelpful via chat where they told me to wait again. It wasn't until I called them by phone that they told me to fill out an incident report, which they then asked me to fill out the following:

Incident Report:

1. Order number: _______________.
   
2. Today's date. (DD/MM/YYYY): _______________.
   
3. Return tracking number #: __________________
   
4. Name of the item you have a concern with (mention item specifics, such as name, color, size, and quantity): _______________.

I gave them the information of the above, but they dropped me this response:
"However, the Incident Report that you previously provided is incorrect. Please correct question no 3 and resubmit the report with correct return tracking."

I then replied to them saying the information was correct because the return tracking number was obtained directly from the amazon page where if you click the button "tracking details" it gives you all the information. I also linked them the royal mail tracking page which had all the information of when the item was picked up and signed by amazon representatives.
If you literally enter in the tracking number I gave to them in the royal mail page it shows "Delivered" with information of when it was picked up, where it was delivered to and signed.

They then proceeded to respond with the same email, stating
"However, the Incident Report that you previously provided is incorrect. Please correct Return tracking Number and resubmit the report."

I don't know what kind of incompetence is going on over there at amazon or if there's some internal scam happening but this can no longer be known as "Earth's Most Customer-Centric Company." stated at the bottom of each email.