It seems that the settings related to Drive Lock Mode is programmed to OFF or a malfunction due to which no door will lock when the speed of Tata Tiago will exceed over 10 Kmph
You need to enable drive away locking from vehicle set up
> Turn on ignition,
> There is a setting option in Harman Music system .
> Press set up option
> Vehicle settings, drive away lock and activate it
This will turn on the Speed Sensitive Auto Door Lock Option in your Tata Tiago Car
Hope should help !!