GoAir — high cancellation charges and poor customer support

I did a booking of flight from pune - patna just few minutes back for 2nd feb 2019. By mistake, i put the wrong destination and i just wanted to swap the cities but the cancellation charges for a small mistake too is 3000 inr.
I called the customer care and talked to gaurav for this adjustment but they are asking me to pay for the cancellation charges plus extra penalty. Pnr no. Zf87je.
No courtesy from the airlines towards customer to adjust on few points and showed the rule book. This air line just want to bankrupt their customers and get rich, money - minded airlines with poor customer services.
Just think from this perspective, a person who is flying in case of emergency and did this small mistake, had to pay a penalty of 3k per flight and then re-book the flight. An average salaried person in india will had to go through so much because of these money-making rich airlines, who charged 3k for the cancellation of a single flight booking. Each one should file a case against these airlines in india and take some action on their cancellation charges, really [censored] flights with [censored] money-making rules.