[bydrake7]

My "wrong item" got collected and sent back to Amazon, delivered there on Tuesday, I have received no notification from Amazon themselves of them receiving or acknowledging the delivery. Is this a cause for concern? I was going to jump into a live chat but it says to wait 2 weeks.

It's not an Issue.

They would've definitely received It and will assess the claim thereafter, hence they've stated to wait a couple of weeks - which Is a little lengthy for such a simple claim.

UPDATE: Success! Got in touch with live chat and they still hadn't processed the return, the first advisor was saying "We still have not received your return" etc. and I was getting frustrated so asked to speak to a supervisor, got told the classic "they will not be able to assist you any more than I can" rubbish.
Got through to the supervisor, had to fill in a small form explaining my return, how was it sent, what date was it sent etc. and he processed my refund there and then. Currently on its way to my bank account.

Thanks @mothered for the advice and the blog you created, never considered wrong item received before and it worked a treat.

great work here, thank you for sharing your experience