Peppertap — Fraud on cash back 500

Address: Gurgaon, Haryana, 110017

They have offered Rs 500 Cashback on shopping of Rs 2000 cumulative orders from 23rd to 29th February 2016.
I had made 04 orders worth Rs 2003 and used FEB500 on every order. I have made all the payments thru debit card so I have all the records of payment amount.
The cashback of rs 500 will be credited by 1st of March 2016, which was not made, I have talked with their customer support so they told that it is in process as due to heavy rush it is taking a time in settling down.
On 07th March 2016 I have again called them up and understand from one of their executive that we have used coupon code on 3 orders worth of Rs 1489. Then while chatting with their customer support I understand how they people cheated their customers. He said yes I have used coupon code in all 4 orders but the worth is Rs 1997. Which they have did they have reduced the value of my payment by 4 Rs. But I had a proof of payment of Rs 490 as I did online payment and after then they are just lying
They people are just making fool with these kind of offers