Amazon India — Sound Bar Coupon not yet received

I have purchased Samsung Crystal 4k UHD 65 inch TV on 7th Oct. As per the partnership offer, it is mentioned that free sound bar coupon (at the cost of 1 INR) should be send to the registered email id of the amazon customer (me) after 30 days,

I have waited until 8th Nov and called the amazon customer support, they said, it is in progress and you will get within 5 days. I have waited again 5 more days and called after 5 days. This time, they have told please wait until 30Nov21. But the issue is the coupon validity should be 30th Nov21 as per the partnership offer page, So if amazon send the coupon on 30Nov21 around 11:50 PM, I can not redeem because of the validity period should be over.

I am not sure whether this is kind of online scam (get the partners free product and sell it online without giving to customer).

I would like to complaint so that other consumer should be ware of festival season online fraud like this one from Amazon.

I will try to call them again until 30th Nov 21 and will take necessary action afterwards if I will not receive the Coupon on time and not able to get the free 1 INR sound bar.