Reliance Jio Infocomm — Unable to activate IMessage and Facetime

I recently upgraded to a new phone and ever since I changed it I am unable to activate iMessage and FaceTime. I have tried literally everything. Jio care has been useless so far. I have contacted them via twitter and WhatsApp but they give generic responses with no solutions. Things that I have tried:

1. Removed and insert sim again (didn't work).
2. Reset Network settings (didn't work).
3. Rest my phone to factory settings (didn't work).
4. Swapped my sim in another phone (didn't work).
5. Tried apple support but they said it's network operator's fault and Jio Care said it is apple's fault (like seriously).
6. I tried restoring my phone to iOS 16.1.2 (one lower firmware than the latest) (didn't work).
7. I restored to iOS 16.2 (didn't work).
8. Tried enabling iMessage and FaceTime with Apple ID (with no problem) with hope that it might jump start the activation to the phone (didn't work).
9. Tested the sms service (can receive and send normal text messages).
10. Tried airplane mode and turning my network back again (didn't work).
11. Topped up my phone with balance (20rs) (didn't work).
12. Deregister my phone number on Apple ID and registered it again from phone's settings (didn't work).
13. I also checked that my phone number is written in SettingsPhone. I deleted and wrote it again (didn't work).

I have tried every possible scenario I can imagine and read on the internet. And it's not the fault of the phone (14 pro) because I tested my dad's Airtel sim which activates the iMessage and FaceTime on my phone.

It's so infuriating because jio care has been useless. They even ghosted me on twitter dm's. If today I go and give a request to port my number to Airtel or Vi, jio customer service would literally beg me to give them "another chance". But when the situation I am in, I ask them to help me, they disregard their customers like they don't care. I might actually port my number and save the hassle of jumping through the hoops. This is my last ditch effort.

Attached the screenshot of the error and them ghosting me on twitter.