Glad to see your clarification. However, I am quite confused about a question which is how can they took my services away to their company without your confirmation. As you said, I could get my services back when the 3rd provider gets the response from their customer, which means NBN or that provider need to confirm it and then they are able to change it. But I didn't get any information from you and NBNCo, and I didn't provide the serial No. to anyone or provider before. And then my service still changed? This is weird.
Technically, when NBNCo updated their records, the Location ID (locid) that was previously assigned to your address has been assigned to another address instead. So when the other Provider placed an order using the locid, they basically placed it to a different address that shouldn't have an existing service, not knowing the locid is the one you're also using.
Now, due to conflict of records, NBNCo needs to get both parties to submit pertinent details (proof of occupancy document and NTD Serial Number) for them to amend the information on their database.
Based on the recent update from NBN Co, the order has now been submitted to the correct address. No technician is required as this is for remote activation. The planned completion date is on 03 December 2019.
Please ensure that your router is connected to the UNID-1 port on the NBN box.
We'll continue to monitor the progress of the case and be in touch again for any updates available.