Chorus of faults
If you talk to a Chorus tech about fault calls on copper lines, you will discover that
(a) the ISP that logs a fault doesn't pass on any information about the nature of the fault, however specific the end user was;
(b) the tech is an independent contractor who gets a small fixed sum per fault logged as cleared.
This explains the large number of faults logged on the copper system: the techs are paid per fault call logged as cleared, not per hour or per fault actuallycleared. They are incented to spend as little time as possible per call and log it as cleared ASAP. To actually get a fault fixed, the end user has to call it in repeatedly until an honest tech shows up. It is, as the saying goes in NZ, a rort.