iMessage and FaceTime is not working with my number and keeps saying activation

I swapped carriers on Monday and the switch went over on Tuesday to a new phone. It is now Thursday and Since then iMessage and FaceTime does not work with my number it keeps saying activation unsuccessful. I have tried everything on Google, apple support said there was nothing they could do their end and it was to do with the courier I have spoken to the courier twice and the first time they said everything is right there and and then the second time they escalated it again but it still isn't working. Any tips?

[Re-Titled by Moderator]