Incorrect item received to what I ordered( #***) Return reference # MRRN-SVZZJ-MYNV

Ordered a men's sneaker on Thu 21 July 2022, delivered Mon 25 Jul 2022. I received the incorrect sneaker and immediately logged a return request. Was asked via email to send images of the item and package I received( immediately did that. Preferred Outcome: Replace with correct Item I ordered. Thu 27 July 2022 received email confirming it was a case of picking and packing error at the warehouse being kindly advised that a replacement order will be sent as soon as possible when return arrives at warehouse. Instead of sending the correct sneaker as per email they concluded my return 29 Jul 2022 @ 17:16 and did a credit. I am stil back and forth but now being told the supplier/seller is out of stock for my particular item ordered but when I was online on the 1 Aug 2022 the exact sneaker I ordered was available and took screenshot and sent to same lady that has not been helpful. All I want is the correct sneaker I successfully ordered and paid for to be delivered asap. I do not want a credit nor refund. The issue I assume is because the sneaker went up in price during the return process. Now how is the client liable or responsible for a warehouse error... I have orders in my cart that I want to complete but not with the credit they did without permission. Take accountability for the error and send what I ordered and paid for.