New Delhi, Nov 20 (ANI): The Congress party attacked ruling Bharatiya Janata Party (BJP) on Thursday for failing to keep its pre-poll promise of bringing black money back from foreign accounts. Congress spokesperson Ajay Maken said BJP has failed to achieve what it mentioned in its manifesto before coming to power. Maken further attacked the party for singing to the tune of 'good days will come for all' but no work is happening at the grass root level.