[Resolved]  Indigo Airlines — passengers name spelling mistake

I have made a booking from goibibo.com for delhi to ahmadabad flight ticket for 16 june for 5 passengers with pnr no. 6e/pbk2gc. Mistakenly i made a spelling mistake in one of the surname as pati instead of patel. After calling and requesting for 2/3 times one of the senior person accepted to make the change and told me to email id proof of the person on email which i did immediately. Afterwards they denied that we cannot change the name, when i told them that one of the executive had confirmed me to make the change, they are now taking 72 hours to hear he recording. I have to call every 24-48 hours and every time they say to call me back again after 24-48 hours.