[Resolved]  Indigo Airlines — charged unnecessary extra charges

My family was travelling first time by domestic flight, they had total 36 kg baggage. There were not aware about 15+7 kg allowance. Counter person not assist them about baggage allowances and charged 2400 rs for extra 6 kg which they can told to keep as cabin bag. After discussing with indigo manager they accepted their mistake but said they can't refund the amount now.