Contacted a sensible person at the ISP/carrier who was able to tell me that my new bundled connection is the National Broadband Network 400 GB per month internet component & my original phone number. I can ignore the letter that says my phone number will cost $39 per month, he confirmed the old original phone number is included in the NBN bundle.
It's not so much the right hand not knowing what the left hand is doing; it's more that the right hand doesn't know the left hand exists while the left hand knows all about the right hand.
And I worked for that mob for 31 years. No wonder I'm a mental case & a nervous wreck.