Like it or not, but Telegram is a pain for the government
This ban is being done to show the government agencies are not incompetent

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This ban does nothing, and what if the users just moved to another app then India is going to keep banning every app?
As said CBT is proposed to avoid these kind of compromised individuals in future but it may be changed in the future but not for this one.
As of now, I am using a VPN on my iOS device to access Telegram.
I need it on my PC so I tried the same and installed VPN, now everything works fine. So this is how their ban works, just VPN voids it while it leaves millions of users to struggle for something that they have no connection at all.
The one who leaked should be punished, not the rest of the country.