Ok something thing doesn't add up here, you said you returned it 4 months ago and got the Refund after 3 days. Now you are saying they refunded the money two months ago? Which is it?
Either way, I am just double checking, you did get the refund before you sent back the Quest 2?
Are you deliberately misunderstanding just because you are mad at Amazon or what? They aren't stealing and you did give them permission. When you do an RMA with Amazon and take the option to get a refund before you send the item back, you are giving them permission to charge your bank/card if you don't send back the item. As I said, the email that they send out states this pretty clearly. They give you 30 days to send the item back, if they don't get it back, they charge you.
You don't seem to get that Amazon hasn't received the Quest 2 back, you sent it, they didn't get it. That's why they charged your card. This isn't personal from Amazon. They aren't trying to scam you. Seriously, do you really think a multi billion dollar company is annoyed at you for a £350 refund?
As others have said throughout this thread. Your photos aren't proof of anything. You could have easily taking the photos, then put something else in the box. Amazon can only go by the box they got referenced to that tracking number.
Somebody else asked already, but, would you know from the outside of the Box that there was a Quest 2 inside it? Did you tell the the person at the Hermes drop off point that there was a Quest 2 in the box?
I would be willing to bet all my money that somebody at Hermes, whether intentionally or accidently, switched the labels on the boxes, and somehow your label ended up on a box of home decorations. That's why, if I was you, I would be going after Hermes, they are the ones that messed up.
Don't bother with trying to go the Small claims court against Amazon for stress. You have no case. It would a futile exercise and a complete waste of your time and money. And just end up with you been even more stressed.
Your only hope of getting anything is going after Hermes. And even then, the best you can hope for is getting your Money back.