I got a mail from Oxigen wallet that on transfer of Rs.21 to another oxigen wallet, you will get Rs.51 cashback.
Firstly, I thought its fake.
But then I transferred the money the money by adding Rs.21 and sent.
After few days, I got a text regarding Rs.51 cash back
And used it to recharge my mobile.
A very superb app with ausumm interface.
Love it.