Is there any way of speeding up the disconnect/reconnect process on a Chorus UFB install?

We've just moved into an office (moved in last Wednesday, February 1st) and BigPipe had planned on connecting us on Thursday morning (February 2nd). Turns out we were given an incorrect address by the landlord for our existing ONT install (this building has three-four tenants and a confusing address structure) so BigPipe switched on an ONT that's not actually ours (through no fault of BigPipe).

Now we are at the stage where we finally have the correct address (Chorus visited on Friday to replace the ONT power cord and confirm the address and they obviously got it wrong, as the latest word is different from what they said on Friday), however it turns out there's an existing connection with Spark that is scheduled for disconnection on February 15.

This basically means that we are without internet until February 15 which is obviously very inconvenient (there's no ADSL/VDSL that we can fall back on, AFAIK).

Are there any tricks that can speed up the disconnect/reconnect process? The existing tenant has apparently contacted Spark to ask that they be disconnected ASAP, which I would've thought could be done almost instantly, especially since BigPipe is technically just a re-packaged version of Spark (same network etc.)?

Any ideas anyone? Thank the Lorde for 2degrees rollover data and iPhone Personal Hotspot…