Which HealthInsurance policy is better ?

I opted for HDFC Ergo plan for my little brother , just while issuing their policy there were 1000 calls from their end daily till I opted for.it. Later om there are zero calls/ no reply to my mails and nothing. I'm fed up of their service. Hence I'm planning to cancel that and opt for other. Suggest me a good one (acc to your experience) . Planning for 5L annual policy.