Missing product

I had ordered two Derma Co sunscreens from Flipkart on 24 October. However, I received only one sunscreen instead of two. I raised a replacement request on 24 October, but instead of getting the missing item, I again received only one sunscreen on 30 October. Following this, I raised a return request on 31 October. The delivery boy collected the sunscreen from me as part of the return. After this, I was refunded for only one sunscreen, even though I had made payment for two sunscreens. During this entire process, I contacted Flipkart's help centre and also called customer care multiple times, but I did not get satisfactory support or resolution. I now demand that Flipkart either deliver the second sunscreen that I paid for or refund me the full amount for both sunscreens as per my original order and payment.