Can anyone please show me where you can really start a case against a seller who has not refunded?

[p38arr]

Can anyone tell me where on the ebay website I can really start a case against a seller. Every click just goes round and round!! I'm dealing with a seller who sent me a calculator that doesn't work (and it says Poundland on the back!) so I contacted him and they sent me a prepaid 1st class return label to a different address? 4 weeks on Monday 14 December 2020 since I posted it through a Post Office. Sent a copy of the receipt to the seller. He keeps saying that it still hasn't arrived and clearly has no intention of refunding me. Given him 3 days as ebay state but he is just laughing at me. Where is this so-caled Ebay money back guarantee?

[rusticrye]

In several places:

The 30-day Money Back Guarantee (on every listing, in various other places across the site, and on your order confirmation)

The More Actions dropdown beside each transaction on your Purchase History Page.

The Resolution Centre ( link at foot of any page).

The Help pages with their integral search.

All of the above are easier to find than these forums, so I'm not sure how you managed to miss them all, yet managed to find your way here.

@p38arr