Shoppersstop.com — order return initiated but product not picked up and refund is blocked

Address:

Gautam Buddh Nagar, Uttar Pradesh, 201301

I ordered a pair of shoes through shopperstop online app and it got delivered on aug 7. On same day i initiated return as it didn't fit me well and waited for product to be picked up. After waiting for a few days, i called up customer support and was assured that it will be done in 48 hours. Nothing happened after 3 days, i called up again and got assurance that it will be done in 3-4 days. I kept calling and dropped emails as follow-up and every time assurance was given that they are escalating issue to seniors and will get it closed soon. After multiple follow-ups, i again called customer support on 27th aug and again was promised that it will be done in 3-4 days. I got email as well about a return slip. However, today after 4 days since i did not get any update for pickup, i went to check the status in app, and to my surprise it showed pick-up failed and return cancelled.
I've been following up with these guys continuously and there is no action being taken for picking up the product and my refund is blocked due to this.

Please help.