In my case: My sister applied for Axis Flipkart 2.5 years back, She did the first transaction and Received the voucher of Rs 500 from Axis Bank easily, But the another voucher from Flipkart was not credited for 3/4 months (approx),
We contacted customer care about the issue, but took the complain (Flipkart said Axis will give another 500gv, Axis said we give 500, Another 500 will be given by Flipkart)but nothing happened and the truth is they didn't gave any attention at all in that matter.
We had all the screenshot and proofs that Flipkart was offering total 1000 gv after fulfilling all the conditions after card approval, So ,we threatened Flipkart we may go to consumer court if they don't provide total 1000gv.
After that threatening email, the gift voucher was credited within 2/3 days, I remember.
So, Flipkart's police is they won't give you that 500gv easily if you don't fight hard for it.
Many customers lost it too due to lack of awareness, I think.