Flipkart - Incomplete Name in International flight ticket

I have booked an international return flight tickets on Flipkart for airline Go First which is costing me almost Rs.**k

Due to a technical issue with Flipkart, I could not enter my full name as per passport records.

When I inadvertently proceeded with the booking, Flipkart by default used pre stored names used for domestic travel of both myself and my wife. But for international travel, the name should match exactly as in passport with initials expanded. But the booking form in Flipkart app does ot support adding expanded Surname in the last name field.
I have also attached the screenshot of the error message. I get an error 'Please enter valid name'.
Now Go First is denying update the name as per passport records. Flipkart is not providing an update. My flight is on **th Feb** and I contacted both Flipkart and Go Air more than one month in advance to correct our names on the Flight tickets. I need to immediately rebook tickets if our names are not updated as there is a chance we can be denied boarding if name does not exactly match the passport name. This whole issue was caused due to faulty ticket booking system of flipkart. They have still not fixed the bug in their app where Last Name can be expanded while booking.