A payday lender and its director have been fined more than $70,000 and banned from carrying out consumer lending.

Twenty Fifty Club and director Gavin Marsich​ were sentenced in the Manukau District Court after being found guilty in June of 16 offences under the Credit Contracts and Consumer Finance Act, the Fair Trading Act and the Commerce Act.

The offences included charging unreasonable credit and default fees, falsely claiming to be a registered financial services provider and failing to supply information required by the Commerce Commission for its investigation.

The South Auckland company did not charge any interest, but rather a fee that was 50 per cent of the loan amount as a "marketing fee" or "marketing koha".

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If the borrower did not pay within seven days, the company would roll over the loan and charge another fee of 50 per cent of the outstanding balance.

These fees affected at least 82 borrowers and more than 234 loans.

The company and Marsich have been fined $76,000 and Marsich also has to pay $4400 in compensation to one borrower.

He has also been banned indefinitely from carrying out further consumer lending.

The judge also prevented the company from enforcing its marketing fee or default fees on any existing loans.

Commissioner Anna Rawlings said Twenty Fifty Club's failure to comply with consumer protection laws caused significant harm to borrowers.

"Twenty Fifty Club provided credit to vulnerable consumers who often required urgent loans and generally could not get credit elsewhere.

"Its customers were not given the important information they needed about their loans such as their right to cancel their contract or the consequences of not meeting their loan obligations," Rawlings said.