Telkom casing a health risk

We have on seweral occasions contacted Telkom to assist us with sewage water running from their drains, but they do nothing. This is now becoming a health risk in our estate and no-one is assisting us. @City of Cape Town is saying it is not their drains so they are not allowed to investigate. People are starting to get sick. We are now investigating our legal rights on this matter and will go public.