Air India — sudden cancellation of flight and rebooking 2 days later without information

Address:

Mumbai City, Maharashtra, 400012

Booked tickets for my parents on 24/5/17 in air india flight ai-584 for travel on 20/8/17 in sector trivandrum-bangalore (File attached). Suddenly on 7/8/17 got an sms stating that the flight is rescheduled to 22/8/17 (File attached). When i called customer care, they failed to provide alternate flight on same day and refused to book me in other airlines flight. They couldn't give any reason for flight cancellation on 20/8/17. As we had connecting flights/plans, so i had to buy new tickets with almost 3 times higher than original price (File attached), wasted half a day at work and also lost my mental peace. My initial booking amount not yet refunded and it is stuck with air india for 2 & half months for no reason. Also the travel agency took their charge for cancellation.