GoAir — can't able to reschedule flight on desired date with desired location from credit shell

Dear sir / madam,

I wanted to reschedule my earlier booking, which was cancelled due to covid. I was advised that i could do it myself from the goair website.
When i visited the goair site, i was really shocked to see that unilaterally go air has modified my itinerary without my consent as follows.

My original booking was made on 14th april 2020.
Pnq-del by g8 143 on 14th april 2020 &
Del-pat by g8 176 on 14th april 2020.
Please refer to my original itinerary issued to me by goibibo - the copy of which i have enclosed herewith. As when i am checking my ticket in manage booking in go-air site it is showing me a pop-up saying - your flight (S) is cancelled. To make sector changes on your pnr, we request you to contact the call centre as your pnr is protected under ‘protect your pnr’ scheme.
But now it is showing in the go air site, the pnq-pat sector on 13th december, by g8 5214, which was never changed by me.
Please refer to the attachment.

Now i want to reschedule the flights as follows.
Pnq-del on 17th september & del-vns on 21th september.

This i am unable to do, as the outward has become inward & inward has become outward in the go air website.

Please rectify this mistake urgently so that i can reschedule the flight myself.
Alternatively, your representative can assist me in the booking.
Details: - pnr = u5g53slast name - singh
Email - [protected]@gmail.com


Thanks & regards
Saumya singh