https://www.amazon.in/hfc/mobileRe...ge
Just do a recharge with disconnected plan or by selecting wrong operator , immediately you’ll get collect coupon email, and also recharge failed email. Collect those coupons ( i got 2 offers,if you’re eligible for more offers you’ll get mail to collect all those offers) . Within 10 minutes you’ll get refund for failed transaction.
can try with 10 rs recharge by selecting wrong operator.
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Nothing special with airtel, you can try 9-10 Rs recharge also by Selecting Wrong Operator, recharge will fail & You’ll get Coupon also.