Amazon India — Worst service provider - amazon india

Address:	Purulia, West Bengal, 723202
Website:	www.amazon.in

I had placed an order for xiaomi redmi note 3 (Price - rs. 10, 999 with additional 20% cashback within 5th january, 2017) on 3rd october, 2016 in amazon india. The first shipment starts on 7th october via blue dart courier service. The first delivery date was scheduled to 14-17th october which got rescheduled to 20th october to 24th october. I have following up with amazon from 17th october about my product. Every time they will say wait for some more time, we are looking into it and following up with blue-dart though nothing was really happening in reality.
On 25th october, i got to know that my product delivery got cancelled due to some unknown reason. Immediately, i called amazon customer care about this particular situation, after a long discussion the lady (Urvashi) assured me that they are doing an replacement on this product with the same price and same offer. But after sometime, she told me that this product is not available from the same seller, hence i will not be eligible for the cashback. As i faced lots of difficulties for this product, she assured me that instead of the replacement, they will give a full refund along with the cashback of 20%. She also ensured me that she will drop me an e-mail about this.
After waiting for 1 hour, when i didn't receive any e-mail from her, i called amazon again. But this time, one guy from the same team (Refund & return dept.) contradicted by saying that we can't give you the cashback as this is against our policy.

Dear sir,
I would like to state that i am not greedy for the cashback. But the amount of harassment i had to go through for this product from amazon, i would really like to file a police complaint against this e-commerce giant.

Please do something.