Kelin said he was astonished the driver had left him and his sister. "I was pretty frustrated - it was just a big hassle," he said.
Ms Te Whenua said in her view, the bus company had shown no regard for the children's vulnerability or anything else that could happen to them as a result of being left alone.
In the end, the children's father made the two-hour round trip from Auckland to pick them up.
Ms Te Whenua said the incident was not good enough.
"They have an inherent responsibility to all passengers to take all reasonable steps to ensure that passengers are able to engage with their service," she said.
Nakedbus.com chief executive Sheryll Otway said the company could have handled the situation better and the incident was under investigation.
"In the end, the responsibility is ours - people have to be safe - we don't take the responsibility of our passengers lightly," she said.