It may happen that you did a transaction via RETN Deals, but your transaction was not tracked by the system. We would give our best efforts to help you get your cashback. To do that we would reach out to our partner merchants and rest your case.
To claim missing cashback:
1. Create a support ticket using the Missing Cashback link in the footer.
2. Attached your purchase proof.
Amazon India is currently not able to identify specific user. So do consider using this missing cashback claim for Amazon India without fail.