The Stop the Hub group's petition passed the 6000 mark last week, but Shellharbour Mayor Marianne Saliba says she is concerned people may have signed the petition after being given "wrong information".
Cr Saliba said on Wednesday that she continued to receive reports of anti-hub campaigners urging shoppers and library visitors to sign the petition to help save the jobs of library staff even though no jobs were under threat.
"Through the development of a city library in the hub, and the retention and upgrading of our four branch libraries, we will actually end up with more library services and more library staff," Cr Saliba said.
"While I respect people's right to express their views, it's important that everyone is aware of the facts about the hub project and forms an opinion based on correct information."
Stop the Hub member Harry Gooden said the Mayor's comments were "utter rot".
Mr Gooden said about 85 per cent of people were willing to sign the petition and few had to have the issues explained to them.
"People are not silly," he said.
"All surveys indicate the vast majority of citizens do not want this hub.
"Last year, Cr Saliba said when people show her they were against the hub, she would take notice, isn't it time she took notice of 6000 people?"
Last month, Mr Gooden resigned from the the City Hub's community reference group, declaring "he could not serve two masters".
"Our mission was to listen to staff and the consultants and talk to people, and the more I talked about it with people, the more I realised they did not want the hub," he said.
The $57 million hub, proposed for Shellharbour's city centre, includes a library and museum, auditorium, community meeting spaces, cafe, council chambers and administration offices.
Councillors are due to consider options for a fixed-price tender to build the hub complex in August.