Wouldn’t recommend, Given a faulty geyser in newly developed house

I bought a newly developed house from cosmopolitan recently. Upon occupation the house came with a faulty geyser, according to their electricians they say the issue is with the geyser thermostat. I have logged the issue with them multiple times and there is no resolution and all they say is that a geyser thermostat is the homeowner’s responsibility. What I fail to understand is how is it my responsibility if they gave me a faulty one to begin with. I have been going for over a week with cold water. I would give zero stars if possible because whole process with cosmopolitan has been hell. From uninformed agents, no communication and now the geyser issue just put the nail on the coffin. I would NOT recommend this company to anyone else.