Correctional Services spokesman Manelisi Wolela has denied allegations that student leader Mcebo Dla.
The South African Democratic Teachers Union (Sadtu) is opposed to subsidies for privileged schools.
Responding to the Education Department's proposed introduction of school-fee subsidies for former model C schools, Sadtu's media officer, Jon Lewis, said the subsidies were not fair and would add to further tensions.
He said rural and township schools needed more resources and upgrading, and department funds would be better channelled there.
"We support the improved regulations on fee exemptions, especially in schools that have been treating their schools as private property," Lewis said.
"This is good because it allows for any child to have access to the school of their choice. But we cannot continue to fund schools that have inherent better resources and charge fees of R10000 a year, when other schools have yearly fees of R600."
Lewis said subsidising the former model C schools would be a continuation of a two-tier system of education.
Subsidisation undermined poorer schools.
"This is an elitist and divisive approach, and not a long-term solution," he said. "You cannot pay more for one and not pay the same for the other. What we need is funding to be channeled more for better resources in poorer schools, in particular rural schools where we are constantly told there is a crisis."
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