SportsDirect.com review: Refund

I placed an order on 2nd December 2024 Order ref sd40000117899368. From that order, I did not receive one of the shoes (product Code - 210341/40/255) which I was told was in process and after many conversations about it being in the warehouse was told it wasn't available and finally got a refund for it in February 2025. I returned the second product (product code 270826/03/240) and am still arguing with customer representatives to get a refund. I am tired of having to explain the same story repeatedly and just want my refund. They acknowledge that it was mailed but tell me it hasn't reached their depot. This is not my issue I have mailed it and have proof of this.