MichaelNZ:
An update:
I took the phone to Palmerston North Noel Leeming this afternoon. They accepted the return but tried to force me to take gift vouchers, which I didn't want to accept.
I pressed the point and they eventually agreed to a refund but they clearly didn't want to do that. Furthermore, I would have to wait for the refund to be processed and the sales lady did not want to give me a receipt acknowledging they had received the phone back in good order.
I will contact my bank tomorrow to inform them of the matter but I hope it doesn't come to a chargeback.
Given how risky it apparently is buying from Noel Leeming I will try Harvey Norman in preference next time.
You can't really blame the retailer on this as the box/google website does say supports band 28, the issue is here that it only support 1/2 of band 28 and it's very hard to find anymore info on it. All the retailer knows is that it says it supports it. Maybe vodafone and 2degrees need to let retailers know that it does not support their 4g bands to stop confusion to customers