They are advertising 300 rs cashback every month for 12 months on website https://www.microsoft.com/en-in/mobile/campaign-mobikwik-cashback/
but they are making excuses about technical issues and not allowing users to redeem coupon. Ticket 3988909 is proof of their backing out from the offer.
Jan 3, 2016
Complaint marked as Resolved followed up with them a lot to get CB for this month! Lot of time and money was wasted on phone calls etc and it seems instead of strengthening their backend, they are justing making it impossible for users to redeem code so that people trying to take undue advantage are discouraged and leave the ecosystem. Genuine people who make such companies survive are also facing lot of inconvenience but no one seems to care about them.
My suggestion is to keep calling customer care of mobikwik till they resolve your issue. Pretty frustrating experience!!!