Disgusting service which costs the earth. No response no reply and no fix up

This company has rude staff, is unqualified and takes no responsibility . They did a geyser installation WITHOUT A GEYSER ISOLATOR AND THE POWER CABLE NOT IN A CONDUIT. Then the entire geyser came off the wall and pulled all the cables out of the ceiling. This man refused to take responsibility to fix this as he is in a wheelchair and refuses to come and check the work that his so-called staff have messed up. The water from the pipes leaked into my ceiling and damaged the ceilings and the walls. No remorse from him just his hand out for the money please