Amazon India — order #[protected]

This is regarding the rs.10000 cashback for lg g6 mobile of rs. 51999 purchased from amazon india on 25/04/2017 with my hdfc credit card order #[protected].
The cashback was supposed to be credited back to me by 31st august 2017. However, this is not done yet.
I've been in touch with amazon customer service team since then, however every time they ask for 2-3 business days extension to check with their payments team. I never hear back from them. I've to call/email after this period and the cycle repeats. So far, it has been 25 days and i haven't received my money back.
I would like this to be done asap!!

Also, please find below links that i found on internet confirming the same.
http://indianexpress.com/article/technology/mobile-tabs/lg-g6-price-specificatio...⇄
http://gadgets.ndtv.com/mobiles/news/lg-g6-goes-on-sale-in-india-1685561
http://www.firstpost.com/tech/news-analysis/lg-g6-officially-launched-in-india-p...⇄
http://www.techsetting.com/lg-g6-goes-sale-india-rs-10000-cashback-amazon/

Summary of interaction with amazon:
1) 31st august - officially last day to receive the rs.10000 cashback per your offer, also confirmed by iyappan m. On 19th august.
2) called on 1st september - pavithra m. Confirmed that it would take another 3-5 business days and abhilashkumar a. Confirmed that it would be delivered by 7th september.
3) called on 7th september - omkar confirmed that it would be delivered by 11th september.
4) on 12th september - santosh s. And uday. G and on 13th september - megha k told me that i'm ineligible for the offer since it was running between 26th april and 1st may.
These guys were referring to the rs.7000 cashback offer running between the above mentioned date. However, they failed to check that there was another offer running only on 25th april for lg g6 between 9 am to 9 pm within which i had purchased the mobile and i am eligible for it.
5) megha realized her mistake and confirmed on 13th september that she would personally follow up with me within 24-48 hours for the same.
6) after this riaz and vishnu from amazon resolution team have been in touch with me doing the same thing again, i. E. Asking for 2-3 business days extension again and again.

Now, i want to take this company to consumer courts for penalizing.