Amazon India — no refund even this week.

Address:	Mumbai City, Maharashtra, 400064
Website:	www.amazon.in

I've been waiting for the refund of my purchase that I've made on Amazon India last week and today a new week and still my refund isn't reflecting on my card.
They've sent me everything considering the refund process, stating that it has been processed and should reflect by now.
I have the refund reference number : 75260828185021132948831
and the auth number : 038246
Order number :[protected]
This is for the product OnePlus 6 of which the value is of Rs. 35, 000. I've paid from my prepaid credit card.
They have taken my money, but never delivered it saying that the address needs verification. Only contacted me with the same email, saying I need to upload my statement which I've done plenty of times already. As of now, they have also locked my account for this reason and I have no idea what else do I need to do get rid of the daily stupidity. They have also tried to ask me to ask my bank to send them a fax of my statement, which is impossible.
Anyhow, I just care about the refund that they're claiming to have processed and successfully refunded.
Please help asap.