SHEIN Unable To Refund When I Sent Them Back Exactly What They Sent Me

I ordered a bikini bottom from Shein with the order number GSO1S261W00MXB4. I did not like the product and decided to return it. I created the return request last week and sent the bikini bottom back a couple of days after submitting the request. Shein confirmed that they received my return yesterday. The bikini bottom I sent back was exactly the same item they sent me, completely unused, unworn and with all the original tags still attached. Despite this, I received a message from Shein stating that the returned items do not match the return request for order GSO1S261W00MXB4 and that they “cannot process the refund amount accordingly”. They did not clearly explain what this means or why they claim it does not match, even though I returned the exact item from the order. I request that Shein review this situation again and process a full refund for the bikini bottom I returned, as it was sent back in perfect, unused condition with all tags. I would like this issue to be resolved as soon as possible and my refund to be issued without further delay.