Coinsecure gives you highest rates to sell Bitcoin in India but I felt the process of kyc n adding a bank is tedious with them, so I preferred Zebpay in my early days and still using it. Withdrawals are processed within a day if you request in their working hours.
I know they provides best rate as they are only pure exchange in India, but i want to ask a question to @Benson Samuel that what are your working days and timing for your Banking Partner? Can i expect my funds to be deposited today itself or do i need to wait till Monday ?