Landline number is saying it has been disconnected but I can still phone out on that number
I recently moved house and asked for my number to be ported with me (moved within 5 mins of old house and same area code). It took a while for me to plug my phone in but when I did I phoned out on it and it connected to my mobile on the old number. However when I call it I get a message saying the number has been disconnected. I have also been told by others that this is the message they get. How do I get this resolved?