Flipkart - Refund

Hi I placed an order through flipkart and paid using debit card. The payment was successful but still the delivery guy asked me to pay cash on delivery stating the payment was not updated on his end. I called flipkart customer care ** times to either get my product delivered or to cancel the order and get my refund done. They are failed to do so and nobodys responding properly and top of all even flipkart people are asking me to pay twice for the same product. Please get my order delivered or get the refund done.