He told the Herald the Commerce Commission had previously agreed to the operator's request to probe Power Marketing's sales practices - which have helped Slingshot recruit 160,000 new customers in two years - over unrelated accusations of misleading marketing.
On the record, Power Marketing has admitted to using Wireline details “from time to time,” but denied the details had been used for sales purposes.
Slingshot's owner, CallPlus, claimed to be previously unaware of the use of the database, and said there will be severe ramifications if data was found to be used for sales.
New Zealand's privacy commissioner, Marie Shroff, has revealed she will conduct her own investigation into the claims.