Here's one useful trick:
Once you register through any mobile and create an account, you get a promo code on your mobile/email.
Keep that code and don't apply it.
Now, register as many numbers you can at Mobikwik, and just keep the promo codes.
Finally, you can add all the promo codes in one single account, the amount keeps adding up.
For Eg: Made account#1, received a promo code, made account#2, received another promo code.
Now applied promo code1 as well as promo code 2 in one single account. ( So the discount amount adds up)
The trick is 100% working, tried and tested.