Air India — compensation against cancellation of flight

Address:

Kolkata, West Bengal, 700144

My flight was from ccu to delhi at 5.30pm on 21th october. Flight was cancelled wich was informed to me at 8.30pm. I called the air india for anykind of arrangement bcz i was with my 2yrs little kid. Unfortunately air india didnt give any kind of assistance. I was compeled to buy a costly ticket by 16318rs, where as my previous ticket was only 6728rs.
I need a compensation money for my harrasment..