How to counter an argument that one can achieve God by going into silence?

[Shri Durgaprasad asked: Paadanamaskaaram Swami, How to counter an advaitin's argument that one can achieve God by going into silence (within)? For this they quote - Mauna vyakya prakatita parabrahman from Shankara's philosophy.]

Swami replied:- Silence means that God is unimaginable and can’t be grasped even by imagination. In such case what is that they have attained?