Air India — change of date in ticket

Address:

122001

I have booked the ticket from delhi to goa trip on 15 feb price 6435/-, but i received the ticket of 12 march, this is the fault of air india portal, i have called customer care for this and asked him to change the date they asked me now the ticket is of approx. 21000 and also pay the charges of rescheule and the charges are 2650/- when i asked why only i bear this loss if the fault is of your side then he asked me then please talk to my senior for this, he will help you for this and he transfer my call to his senior and to hold for 2 minutes but i hold for 45 minutes, but his senior not come on the phone for solving the issue because he knows that the fault is from their side, if the fault is from their side then why i should bear the loss.