Myntra.com — Refund didn't received

What a pathetic service it is. I haven't received my refund yet, it has been 15 days from the day I returned your product. None of the other online shopping platform does this.. they refund immediately as soon as they received the product. What's so special in you huh. Do you guys have any idea what a person is going through. We are not ### who wait for our own money to get it returned back. Refund me ASAP or else sueing you will be THE BEST option provided to me. Actually you guys have to pay me the principal amount+ interest, for holding up money for more than 15 days.