Different coupons have different validity and this is mentioned on the Terms & Conditions on each coupons. You can go through the same and redeem the coupons within the respective validity period.
Will I be charged extra for the coupons?
What should I do if coupons have not been received after a successful recharge?
How long does it take for the coupons to reach me?
How can I utilize the coupons?
Can I give these coupons to anybody?
Can I order only coupons without recharging?
I want to distribute coupons through you. What do I do?
Can I order more than 1 quantity of same coupon?