Cashkaro is one of the best cashback sites in recent times. I use this site regularly. Almost every transaction has been tracked by them. But there are very instances where cashback is cancelled by them. They have provided me cashback, even though Amazon cancelled it from their end. In recent times, the food orders and recharge transactions are getting confirmed in less than 10 days.
The redeem options are also very good. One can club the reward and cash earnings and get the gift card. The only drawback is that few transactions are taking months to get confirmed.