Correctional Services said that “matters are under control” at Johannesburg’s Sun City Prison on Wed.
A 13th case of fraud has been opened involving insurance and investment giant Liberty Life, police said yesterday.
Captain Thembeka Luthuli said no arrests had been made yet but that police were working "around the clock" to find the perpetrators.
All 13 cases of fraud were opened in the Durban area between December last year and this month.
The victims claimed that large amounts of their salaries had been debited from their bank accounts, allegedly by Liberty Life, for premiums they did not owe.
Only two of the victims had met with brokers but had never signed contracts or released any personal details.
The remaining victims had never met with any broker.
Mandy Denton of Liberty Life earlier said most of the victims have been refunded.
Luthuli said the deductions now exceeded R10000.
Police suspect the fraudsters somehow got hold of their victims' salary slips.
Last week, Denton said five independent brokers had used personal client information to submit unauthorised policy applications.
"We are working with the Liberty Life investigators but we want concrete evidence before we make any arrests," said Luthuli. - Sapa