Installed geyser but caused more problems

My geyser leaked and needed to be replaced. I contacted insurance, and Brackenfell Plumbing was assigned. Everything went well with the installation on a Friday. But today I discovered that my ceiling is brown and water is dripping through a light fixture. I checked the geyser - one of the new pipes they insisted they must install is leaking! Brand-new and causing more damage than my old geyser didn't even. They don't answer their phones on a Saturday, and there's no emergency number. I must now pay out of pocket to get it fixed.