Myntra.com — no refund on incomplete product

I have purchased a nike black track suit from myntra and they sent only jacket, the lower was not in package... Due to rain and bad weather condition i was not able to call for 48 hrs... When i called to complain then they told that 48 hrs has been passed so they can not escalate the matter.. I want to return there jacket and i want my full refund
Item no - niketrst30623105
Barcode no[protected]
Order no[protected]-6292403