Nike India — Return for order id G[protected]

I placed an order on the Nike website (https://www.nike.com/in/) and the order id was G[protected] and there was one shoe Nike Hippie approx INR 8800. I had returned the shoe and pickup was also done but no refund has been issued yet for the last three months.I have chased them and provided them with everything but still, no refund is issued and now they have said they can't issue a refund.