Non existent service

Had my system for about3 to 4 months. Had a rain storm and water ran into system damaging battery due to not sealing conduit on roof. As this is a rented system I duly called to inform them of damage. No number off emails or phone called resulted in any action. Eventually the company that did install sent someone out to assess what I had told them. Then I got a bill for a battery and that I need to claim from my insurance. I objected as this was an installation fault. I was told not to pay and that it would be replaced. Eventually got a call from them that they would install a week ago sometime. Never happened, phoned and they promised that they would send someone today to repair. This still hasn't happened and I'm at my wits end. No happy at all.