Needed a simple NBN service move from one business...

Needed a simple NBN service move from one business address to another. NBN turned up to install the service - but wanted to convert an ADSL service that belonged to another tenant - I managed to prevent this from happening. I spent hours on the phone to the Ph Call Center who did not have a clue ...even after speaking to 2 different "supervisors" . The usefulness of the consultants was NIL. I can not explain the frustration experienced. Shifting in today - but still no resolution..... Why iiNET Why?