Nation Housing use of cheap labour

Nation Housing is the worst property developer ever. They like to use cheap labour at Summerplace kuilsriver the drainage system is a shambles and they putting the blame on the residents. We had alot of blockages eversince we moved into this complex but we never knew the issue up until we hired a plumbing company that found stones , sand inside the drainage tell me how did the residents put those stones there i will never buy a house at nation Housing neither recomended anyone to buy they unprofessional.