It's been a 15 days I order a shoes from flipkart but they not delivering im asking for refund still they said your order is delivered bye next days

I ordered a pair of Asian shoes on Flipkart on October 13. Since then, the order has not been delivered, even though every day I am told it will be delivered by the next day. This has been going on for a long time. I contacted Flipkart customer care 4-5 times regarding this issue, but it has not been resolved. I have asked for a refund since the product was never delivered, but Flipkart is not agreeing to refund my money. I request that Flipkart either deliver my order immediately or process a full refund for the amount I paid, without any further delay.