Ibibo Group / Goibibo — credit shell received but not getting applied

I have received the credit shell from indigo but i am not able to apply the same on my goibibo account. I am using it for the same contact in whose name i have received the credit shell. I called up indigo to book the ticket but on their payment portal it says to contact ibibio but ibibio doesn't have the option to use credit shell and ibibio people are not getting contacted their mails bounce their chat is a bot doesn't answer their phone numbers get disconnected on ivr. I am being given a run around since one week and not able to get resolution.
Indigo pnr : fm2tma

Pls help

Regards
Azhar