Spark says it will refund 135,000 ex-customers who had credit left in their accounts after leaving the telco.
The customers will be contacted directly.
The telco says the amounts involved range from "a few cents to over $100."
One report says the total amount involved is around $1m. Spark refused comment on that point. It has not made a formal disclosure to the NZX, indicating the sum involved is relatively modest.
The repayment campaign follows a Commerce Commission investigation.
Spark is in discussions with the Commerce Commission about a billing system issue and two operational issues that relate to a small proportion of the outstanding credits, acting Spark home, mobile and business chief executive Grant McBeath says.
"While this investigation is ongoing, it prompted Spark take a look at the broader issue of account credits. As a result, we decided to take a more public, proactive approach and run a public campaign to encourage former customers to claim their credits."
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