Mr Chauhan said cameras in cabs hadn't stopped verbal abuse as they only recorded movement. He said there had been an incident on Saturday night where a minibus driver went to Gate Pa to pick people up and had been attacked.
"They broke the window. We don't know if it was maybe a shotgun or someone throwing stones, the windows are made of strong safety glass, they are hard to break. I'm not sure if it was because of where we are from, but the police are investigating it."
Mr Chauhan said racial abuse was becoming less common as New Zealand became more cosmopolitan.
Sunand Kumar said he only got abuse occasionally. "People will say things about my nationality, but it's quite rare. It only happens on the weekend."
New Zealand Cabs manager Bruce Rainey said his drivers usually faced no more than one racist comment a week but, compared to the number of customers, it was not too bad.
"Just about every one of them is the same thing 'why don't you go back to your own country'. It really does wear a bit thin after a while, especially when you've lived here for 32 years or so and brought up your family here. It's quite sad that's the best they can come up with."