Apple ID contact number issues.

How do I get my old ported number to be the number associated with my Apple ID, FaceTime and iMessage? I changed service provider and the new number they gave me has been automatically linked to my account. I don’t want this number has has now been recycled as my old number has been ported over. I have tried resetting network settings, signing out of FaceTime, iMessage etc, and removing my sim, all to no effect. Any advice would be very welcome as I cannot use these functions properly and I cannot receive FaceTime calls or iMessages!