[Resolved]  Airtel — Airtel service not able to activate IMessages and FaceTime

I recently bought an iPhone and iMessages and FaceTime services are not getting activated by my phone number. First i thought it was a phone issue so I contacted apple support and did all the troubleshooting steps after that issue didn’t got resolved so they replaced the phone.

So on this new replacement phone same issue is occurring. Now i had a suspicion that this issue was from airtel end but to become sure i added jio sim and iMessages and FaceTime got activated instantly. To be perfectly sure that this problem is from airtel end i added my airtel sim in my brother’s iphone in which iMessages and FaceTime were working fine before. Even in that phone the iMessages and FaceTime was not activating with my phone number.

Apple support said an amount should have been deducted for activating services i also have enough credit in my prepaid plan to send sms to server for activation but amount is not getting deducted.
After calling airtel customer care several times no respond and resolution from them in this issue even there senior technical person saying they can’t help me and being rude.
Please resolve this issue asap.