The commission was yesterday standing by its report and brochure, but said it had asked the council to forward its specific concerns, which it would consider.
Mr Jack said he would write to the commission today detailing the concerns.
He had also raised the council's concerns with the Office of the Auditor-General and asked it to review the commission's report, a request that the OAG was "taking seriously," he said.
"The data they [the commission] have used in the report is old. It's strange they haven't chosen to use more recent information, which is available. At best, it's deceptive," he said.
"As a result, the rest of the region's road assets look better than Napier's despite the fact that anyone who uses the roads would know the roads across the region are generally well maintained."
The commission's report concluded Napier ratepayers would need to spend all the council's $78 million of financial assets, plus a further $45 million to bring the city's infrastructure up to the region-wide standard.
But the council's works asset development manager, Johan Ehlers, said yesterday his calculations put the city $71 million in credit - rather than $45 million behind - using the commission's formula.
"In all my years of public service I'm never seen anything handled so appallingly," Mr Jack said.
Wairoa Mayor Craig Little called the commission's report misleading and said its process had been "deeply flawed".
Wairoa District Council chief executive Fergus Power disputed the report's conclusion that Wairoa was $18 million behind the regional average for infrastructure spend.
Central Hawke's Bay Mayor Peter Butler said the commission's pamphlet was ambiguous because it contained unclear information about the possible repayment of council debt.
"So I rang them up down there and they told me I'm just talking through a hole in my head," he said.
Hastings Mayor Lawrence Yule, who is also president of council advocacy organisation Local Government New Zealand, is due in Wairoa today as part of a LGNZ "reputation workshop".
Mr Little said he would take the opportunity to tell Mr Yule that, in his view, the biggest challenge to LGNZ's reputation was Mr Yule's ongoing support for amalgamation in Hawke's Bay.
Mr Yule said he was well aware of Mr Little's views but his comment was "interesting" given there was no connection between LGNZ and the commission's amalgamation proposal. Napier Labour MP Stuart Nash, who has campaigned strongly against amalgamation, said yesterday he would be taking the councils' concerns about the Local Government Commission's to Local Government Minister Paula Bennett.