Jabong.com — request for returning product order from jabong

Address:

Kozhikode, Kerala, 673502

I ordered a nike sweatshirt from jabong, but the item doesn't fit, as it is size m.
I want to return it & i need refund. But jabong doesn't provide any exchange facility for my pincode, as they say that my pincode is not serviceable. When i called their customer service, they said that i have to return it myself by using the self ship option. Now even the self ship option is not available on their site and app