All good for our upgrades. Spoke with Toby from Vodafone's 'Consumer Inbound Retention' in Christchurch. Got a more suitable plan for my sister and changed our own plan - ten dollars a month cheaper and five times the speed (in theory). All looking good. They sent to Downers Dude to see Helen, and move her phone from a copper cable to plug into her router. (Also wants to buy pine cones from her grandchildren.) All good.
We weren't told that our static IP was going to change. No big deal though. Rebooted the cable modem, Mikrotik RB750Gr3 picked up the new IP address and all was sweet.
We each have our first bill. Helen was only charged for phone, no broadband, very odd. Ours looked fine. We hope that next month billing will settle down.

:-)