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I believe you are talking about this cashback promotion in India, is that correct? Please take a look at the information in the FAQ on that linked page to see if the answers there resolve the issue. If the voucher is in your account, that FAQ will show you how to see it and how it is automatically applied to your next purchase. If there is no voucher and the cashback was not applied, that FAQ should help you to understand what requirements there are in order to earn cashback.
i paid on yatra.com through paypal i got instant 500 off but did not get 500 in paypal account as it was mentioned in the offer.
You do not get cashback, just a discount of the 50 % off on your next purchase, up to R. 200.