Concor Developers - ignoring damp and mould in new complex

Purchased a property in Cape Town, developed by Concor. Three months into occupation, damp and mould started. I raised the issue with the Body Corp and Concor, especially as there was a new born baby in the unit. Nothing was done, Three months later the baby is on oxygen due to the damp in the unit and the tenants have ended their lease . I am still trying to get a response from Concor. Rushana, who was actioned with sorting this out , is completely ignoring me. I have done multiple follow ups and included their Manager Meagan ,who is also unable to get her team to action or respond. What am I supposed to do now? The damp continues and without a tenant, I have a loss of income.