With a non-upgraded wallet you cannot add more than Rs. 20,000/- in a calendar month.
This is as per regulations set by the Reserve Bank of India.
As a result, the transactions that this customer can do are limited.
Also, there can be delays in getting cash-back if the monthly limit of adding Rs. 20,000 gets exceeded.
You can upgrade your wallet for FREE by getting your KYC (Know Your Customer) done. With an upgraded wallet you can store upto Rs. 1 Lakh at any point of time and there is no limit on how much you can spend in a given month.