CGNAT is
ISP Public IP ---> ISP Extra
router to save IP crunch ----> Assign local private IP to your router and other peoples starting with (100.x.x.x)
Public IP
ISP Public Ip ----> Directly assign public ip to your router and you can access your router and your servers directly using public ip
Open a ticket and don't provide resolution otp until your issue getting resolved, atleast try requesting public ip again
I too moved to CGNAT, open ticket, lots of discussion with the Airtel, and forcing to take static IP. 10 days to go with so much discussion and mail.
Airtel backend team member visits home and takes complete 3 hour with his
laptop and with backend team members on call
Later he get to know Airtel has two pools in my area, one is CGNAT, Other is dynamic public pool, He put my pppoe/account to dynamic pool again and issue gets resolved