I think that particular area where mould growing is continuously in exposure to water some thing like they use to hang wet clothes or use water in that area. I think only plastering vents can't be sufficient, try to keep that area dry and use a ventilation system like ventis to reduce moisture...
Yes I too think that this is not due to plaster or paint, this is condensation problem. There might be plenty of moisture in place where mould occur. First ask them to clean up the mould with any best mould remover available in market and then use a ventilation system like ventis to reduce...
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