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?

[pixiesen2012]

to qualify for ebays money back guarantee

 you have to open a case in the

• Resolution Centre

and return the item using a tracked postage service to the address provided

if you did these things and added the tracking number to the case you can ask ebay to step in and refund you,

if you didn't do the above there is nothing you can do through ebay