The incident comes a few days after the Garden Route SPCA in Tamsui Industria, in the Western Cape, fell victim to burglars last Wednesday night.
Monday’s protest action in the east of Johannesburg saw a fire station, hospital and commuters affected, and a pensioner suffered a head injury.
Police said the robbers had smashed the counter top and one other display unit, making off with whatever valuables they could grab.
Yet the municipality argued it was not wasteful expenditure because the existing speed humps did assist speed regulation.
At least 13 officials are expected to be served with letters of contemplation of suspension over the incident.
Photographers have allegedly called for a unified boycott against the botanical gardens after the introduction of the fee.