iMessage is not working

PLEASE READ! My messages worked fine a few weeks ago, but when I went on it to try it again today, I could not send or receive messages. It would always say “Not delivered”. Now, this is really annoying because whenever I need a verification code to be sent, and there is no email option, nothing sends so I cannot create an account or RESET A PASSWORD! I tried to Add my phone number in the “Name, Phone numbers, Email” box but again, it asked me to verify it is me with a verification code to my iMessages which does not work.

Then, when I went to check if that blue tick appeared in the “Messages > Send & Receive”, my email’s blue tick was there but for my phone number it just showed that grey loading gif thing. I would wait for minutes and still nothing would appear.

I really need my iMessages to be recovered immediately because my account has been deactivated and I forgot my password! Please can someone help me? I own an iPhone 11 and there is no damage as far as I know.