I called FTTP and they have confirmed the ONT serial number is matched.
They said my line is still not activated. Need to pass to another team in BT to follow-up the activation which will take another 5 working days. But it is the third or fourth time I was told to wait 5 working days.
Thanks for the reply @alan325e90 .
I'm sorry there's been continued delays with the order. I can try and find out what's happening if you like. Check your inbox for my message and drop me a reply with the details.