Here’s an answer from Mahindra;
There is no speaker/beeper in the Roxor, what you are likely talking about is the electronic actuator noise of the EGR cleaning itself after shutting down. Open hood, listen to the EGR and see if that’s what he is hearing. This is common on all diesel engines in the world, nothing to worry about if that is what he is hearing, he is likely new to owning a diesel vehicle.