You can use Bitrefill.
https://www.bitrefill.com/india/?hl=enI had used them about 2-3years back and at that time the only thing you could recharge was prepaid phones. I topped up my carrier using them. You have to just wait for the transaction to be broadcasted, I am not sure about whether it is zero-confirmation deposit there nowadays but even then just wait for the 1confirmation and the payment should come through.
When I tried, it was pretty fast once the first confirmation came in.
If you still have any questions you can ask here -
https://t.me/bitrefill