Myntra.com — Did not get refund for the product that i have returned

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I purchased a product from myntra on 2nd oct 2016 and paid for it in cash. I wanted to return it and that is when i realized that it was not marked delivered on the app. On talking to the delivery guy he said its his mistake that he didn't take my signature as it was cash on delivery and he will make sure the product is returned. As i was travelling the next day, i was in a rush to return the product and so i gave the packet to him. Later when i came back home i logged in to myntra to check if the refund was processed but surprisingly it was marked undelivered on the app and there was no mention of refund. I started email communication with myntra on 6th oct 2016 and till date they have been saying that my issue is on priority. I can furnish multiple email communications with them.in my last phone conversation i was told that i will get a voucher for the same amount that i will have to use in 30 days. I agreed to it as anyways i had to shop for diwali and i was ok with credit points instead of cash. Now diwali is over and i have nothing in hand - no refund, no voucher, just same old lies that my issue is on priority. I am attaching some emails that i have sent to myntra.