Best Swamp Cooler Repair in Las Vegas NV

Water heater is under warranty and they want to charge me the time it takes them to figure it out what is wrong. When we already know there isnt any hot water. So he left with a water heater unfixed and they want us to sign for a bill and come back tomorrow. So I called the company and asked to speak to the manager or owner and they said her name is Rhonda but they dont know her last name. So I am now waiting for a Rhonda who's last name they dont know to call me back. Terrible!!!!