Getting into the festive groove, Reliance Jio has surprised its customers with an exciting Diwali offer, that it quietly rolled out last night. Under the offer, on a recharge of Rs 399, prepaid customers get a 100 percent cashback. This offer is valid between October 12 to October 18, and will come in effect starting October 19. This validity and activation strategy falls under Reliance Jio’s ‘Recharge now, store and use later’ service, which basically allows users to get a recharge in advance and use it only after their current plan expires.
This means, to avail this offer, users need to get the recharge done between the period of October 12, that is today, till October 18. However, the offer will activate starting October 19, under which they would get unlimited services for the next three months.
Reliance-jio-diwali-offer-bgr-india
As for the 100 percent cashback, which is presumably what caught your attention in the first place, you will not exactly get the money back. The fineprint here is, that when a Jio prepaid user gets a recharge of Rs 399, the company says that they will be eligible for a 100 percent cashback offer of Rs 400 in the form of eight vouchers of Rs 50 denomination. 
It is up to a user, they can either redeem them one at a time or all at once, against future Jio recharges of Rs 309 and above, or against Rs 91 and above data add-ons. But do note, that these redemptions will be valid only when done after November 15, 2017. Also, the ownership of these vouchers is transferable, so you can share it with other people. 
This offer can be availed with recharge via all available channels, that is via the MyJio app, Jio.com, Reliance Jio store, Reliance Digital store, a partner retail store, or via wallets like JioMoney, Paytm, Amazon Pay, PhonePe or Mobikwik.