"Some of them flatly refused, some of them told them to stick it up their jumper, others flatly forget, others are not aware," he said.
Employers advised drivers not to argue with passengers but instead said to ask them to take a seat and remind them they should be wearing a mask.
The new mandate, for passengers on public transport to wear a mask at Level 1, had been "sprung" on the operators very quickly adding to the confusion.
Otago Regional Council transport manager Garry Maloney said the face-covering mandate relied on people taking personal responsibility, "doing the right thing", and following the guidance issued by central government.
The requirement had been conveyed by the Government through its channels.
The council shared news of the requirement as soon as it was confirmed through its website and Orbus Facebook pages, and new posters would be placed on buses to convey this message.
Police were seen speaking with bus drivers at the bus hub yesterday
but did not respond to a request for comment yesterday.