"Our concern with this practice was that it relied on misrepresentations to draw consumers into a sales process, giving Harmoney an advantage in the market it would not have otherwise have had," Rawlings said.
"It also had the potential to harm consumers who responded to the letter. Believing that they were guaranteed a loan, they may have been encouraged to sign up with Harmoney without first checking whether the terms offered were the best available to them in the market."
Harmoney was the first company to gain a peer-to-peer lending license in New Zealand in 2014.
According to its website the company has matched borrowers and lenders for loans worth $370 million.
For the year to 31 March 2016, Harmoney recorded a loss of $14.2 million before tax on revenues of $8.6 million.