It is very difficult to use supercash and see how it works:
for Rs 100 transaction say you get 100% supercash i.e Rs 100.
If you want to use it in a transaction, you can use 10% of it means Rs 10 means effectively 5% .(you cannot get super cash if you want to use existing supercash, On most of the websites I have experienced that you can not use it.)
The next transaction the usage value and percentage will go on decreasing.
Moreover it comes with an expiry of 45 days.
Better to avoid frustrating scheme.