Amazon India — Refund issue regarding the book I ordered from amazon

I ordered a book named "Birth of Non-Congressism: Opposition Politics,[protected]" from amazon.com. The retailer is MK books India, the order was made on 20th june 2020 and I did not get it by the expected date which was given to be 6th july 2020. So i made a request for repayment on 18th july where I was assured the refund will be done in 3-4 working days but I did not receive it. Then I again requested the refund on 4th August where I was promised that the refund would be made in 24-48 working hours but still no avail. On 16th august I called them again and they told me to check with my bank and I did check with my bank and bank manager both. They said that they have not received any amount of 1270 rs(cost of the book), I checked in my passbook, I did not get a refund. Fast forward, today is 10th october and I have called amazon today as well but these customer care guys give the same reply that I should wait for 24-48 hours. I have lost all hope of getting my money. Please help asap. I will provide you with whatever proof you need.