Bad service

My wall is collapsing because Rpm housing plumber didn't compact after digging when they were installing sewage pipes from house to the mainhole outside yard. Now they don't wanna take the responsibility and busy duck n diving they don't wanna fix my wall, They lied to me and whole community that area is an estate and even their previous adverts said area is estate and changed last year to surbub after we complain. I moved in July 2021. They hire illegal foreigners without qualifications. Plastic covering roof torn, ceiling is a mess, floor tiles is worse.