Best Replace Water Heater in Phoenix AZ

We've been with this service for years, but over the last year service has plummeted. Our pool used to be crystal clear, but now there are calcium deposits and algae growing because our salt system wasn't working in the tech never noticed.. Our techs are almost different every time someone comes. We and our current tech have requested a full deep clean at least four times, but the company has yet to respond. It's impossible to get anyone on the phone. We feel stuck in a service that we hate because they own the equipment we use. This is absolutely ridiculous do not use this company.