Got this resolved about 11am today!

Summary (I'll spare you the detail of how many calls and how long I spent on hold to get this sorted) and the steps contain detail as it chronologically occured, NOT when we chronologically found out about it!

• Moved out of old address (lets call it '#11')
• Moved to new address (lets call it '#16A') which is a rental physically attached but seperately addressed to a much larger property (lets call it '#16')
• Move request was loaded.
• Unbeknown to us, turns out the ONT at #16a is actually coded as being ONT number 2 for #16 (Let's call it '16(a)'), as it was installed before #16a was set up as a seperate address.
• Spark provisions our connection as a second connection on #16 ONT number 1, rather than the number 2 ONT that is actually in place at #16a
• Spark leaves internet connection up at #11 and sends us a bill for two parallel internet connections despite us having no active internet.
• Previous provider connection with Now! Internet remains live on 16(a) ONT.
• I ring up and lodge an issue. Spark promptly arranges a fibre order, which results in the Now! connection being dropped from the 16(a) ONT
• A further phone call results in a work order being created to connect fibre to #16a, because at this stage neither party seems aware that ONT 16(a) is a secondary ONT for #16 according to Chorus.
• Apparently, Chorus start planning for an entirely new fibre install.
• 2 days pass, no internet.
• I call up again, and talk with a lovely lady at Spark who figures this all out and has internet live on the ONT 16(a) about 2 hours after I talk with her - Kudos where it's due, she was awesome.
• Waiting on bill to be sorted out so that I'm not paying for 2 connections I never got/used, and actually pay for the 1 connection I did.

So yeh, a little bit of a comedy of errors, partially by me in not knowing that the ONT wasn't physically ascribed to the actual address, but we got there in the end!