Poorly appointed Plumbing Service

I have had perpetual water leaks from a singular tap fitting with Momentum sending different plumbers to fix. This occurred no less than 7 times the past 12 months. Despite requesting Momentum to ensure that their appointed panel are experienced and qualified, this is the result. A raging torrent of water gushed out and caused severe damage to the room on Saturday past. I am holding Momentum responsible for the latest leak that caused damage to my furniture and building now also. They state it is not their problem yet I have repeatedly asked them to ensure the job is done correctly, the first time. Really appauling.