E tu union says customer complaints about shoddy workmanship on Chorus' ultra-fast broadband network vindicate quality concerns the union raised months ago.
The Herald has this week published a number of complaints of substandard fibre-optic installations and customers concerned their upgrade will not stand the test of time.
A homeowner from East Auckland told E tu he and his neighbours were worried that their fibre connections will fail.
Residents have reported exposed cables left open to damage by lawn-mowers, dogs and vandals, as well as the use of duct tape to connect cables from the street to their properties.
E tu communications industry coordinator Joe Gallagher said the problems reflect concerns the union raised in April when Downer lost its installation contract with Chorus.