chrissie: OK, but how often does Telecom, having been given the correct address, manage to get it wrong, like in my case?
It would depend on where the mistake occured.
I'm not defending Telecom or Chorus in any way here but without knowing what was entered into the original Wireline order it's impossible to actually say without a doubt who is actually at fault. Every property has a SAM ID and normally a ASID (phone number) if it has an active phone service. If these were incorrectly recorded by Chorus then broadband could have been easily connected to the wrong line. If you supplised the incorrect information in the Wireline request then it would be easy for Chorus to provision the service on an incorrect line. Provisioning broadband on an active ASID (ie a active phoneline) is easy because you know that phoneline is active at the target address.