Air India — One letter mistake in middle name

Hello I booked Air India flight online from official site and now there is a mistake in my middle name of one letter. And when I contacted to Air India regarding this problem then they told me we are not able to help you and you have to contact airport authority and when I contacted to airport authority they forwarded my call and after that someone answered my call and he told me again to contact airport authority. But no one is solved my problem.